A member of a mobile testing unit of the German Army and German Red Cross presses a doorbell to test residents for the coronavirus disease (COVID-19), following an outbreak of the disease at Toennies meat factory, where employees remain under lockdown, in Guetersloh, Germany, June 22, 2020. REUTERS/Leon Kuegeler

A member of a mobile testing unit of the German Army and German Red Cross presses a doorbell to test residents for the coronavirus disease (COVID-19), following an outbreak of the disease at Toennies meat factory, where employees remain under lockdown, in Guetersloh, Germany, June 22, 2020. REUTERS/Leon Kuegeler

A doorbell switch is seen covered with plastic as a preventive measure during a nationwide quarantine as El Salvador's government undertakes steadily stricter measures to prevent the spread of the coronavirus disease (COVID-19), in San Salvador, El Salvador May 12, 2020. REUTERS/Jose Cabezas

Police ring the doorbell of a building where a group of people enjoyed a rooftop party in a good weather as the spread of the coronavirus disease (COVID-19) continues, in London, Britain, April 5, 2020. REUTERS/Marika Kochiashvili

The doorbell of the kindergarten "Kinderreich" in the municipality of Gangelt, near the German-Dutch border, is pictured in Gangelt, Germany, February 27, 2020. REUTERS/Wolfgang Rattay

Britain's Secretary of State for Exiting the EU Dominic Raab rings the doorbell at 10 Downing Street, London, Britain, November 13, 2018. REUTERS/Peter Nicholls

Volunteer Bea Nevarez rings the doorbell of a potential voter during door-to-door canvassing in Tucson, Arizona, U.S., October 31, 2018. Picture taken October 31, 2018. REUTERS/Caitlin O'Hara

Doorbell buttons are pictured as German police, which also involved Germany's GSG9 special operations police unit, raid sites across the country, in a crackdown on human trafficking and forced prostitution in Bonn, Germany, April 18, 2018. REUTERS/Wolfgang Rattay

Doorbell buttons are pictured as German police, which also involved Germany's GSG9 special operations police unit, raid sites across the country, in a crackdown on human trafficking and forced prostitution in Bonn, Germany, April 18, 2018. REUTERS/Wolfgang Rattay

Forrest Lampe-Martin rings a doorbell during a UPS delivery as the international delivery service gears up for the upcoming peak delivery season prior to Christmas, in Seattle, Washington, U.S., November 9, 2017. Picture taken November 9, 2017. REUTERS/David Ryder

The doorbell of the "Villa Stolberg" in Tutzing is pictured in southern Germany, October 17, 2016. German media reported that Thailands Crown Prince Maha Vajiralongkorn bought the "Villa Stolberg" in Tutzing as his new residence. REUTERS/Michael Dalder

A broken doorbell hangs from the front entrance of an empty foreclosed home in the town of Rochelle Park in Bergen County, New Jersey, March 25, 2015. A surge in bank repossessions of properties in April 2015 pushed overall foreclosure activity across the U.S. to an 18-month high, according to a report by industry firm RealtyTrac released on May 21, 2015. Florida had the highest foreclosure rates in April 2015, followed by Nevada, Maryland, and New Jersey, RealtyTrac said. Picture taken March 25, 2015. REUTERS/Mike Segar

A Ring video doorbell (L) is displayed during the 2015 International Consumer Electronics Show (CES) in Las Vegas, Nevada January 7, 2015. The doorbell connects with home Wi-Fi to send a video call to the homeowner's smartphone. The doorbell retails for $199.00 and should be in stores in the second quarter of 2015, a representative said. REUTERS/Steve Marcus (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS)

Rachel Holmes, a volunteer for the 'Yes' campaign, rings on doorbells as she canvases residents in central Edinburgh, Scotland September 16, 2014. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Dylan Martinez (BRITAIN - Tags: POLITICS ELECTIONS)

Rachel Holmes, a volunteer for the 'Yes' campaign, rings on doorbells as she canvases residents in central Edinburgh, Scotland September 16, 2014. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Dylan Martinez (BRITAIN - Tags: POLITICS ELECTIONS TPX IMAGES OF THE DAY)

Rachel Holmes, a volunteer for the 'Yes' campaign, rings on doorbells as she canvases residents in central Edinburgh, Scotland September 16, 2014. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Dylan Martinez (BRITAIN - Tags: POLITICS ELECTIONS)

Richard Liu, CEO and founder of China's e-commerce company JD.com, rings a doorbell as he delivers goods for customers to celebrate the anniversary of the founding of the company, in Beijing, June 16, 2014. With an iron grip, JD.com Inc founder Richard Liu has dragged China's number two online retailer from a Beijing backwater to a rich New York listing. Beyond the wealth that brought him lies Liu's next target - beating Jack Ma's Alibaba. Like Amazon.com Inc, JD.com has a logistics-focused e-commerce business. The company, whose delivery staff outnumber Alibaba's 22,000 employees, promises same-day delivery in 43 of China's biggest cities. Picture taken June 16, 2014. REUTERS/Jason Lee (CHINA - Tags: BUSINESS SCIENCE TECHNOLOGY TRANSPORT)

A member of the Mortgage Victims' Platform (PAH) rings the doorbell in the headquarters People's Party (Partido Popular) in Gijon April 9, 2013. Spanish protesters seeking to stop a wave of evictions have resorted to embarrassing politicians at their homes over harsh mortgage laws that have multiplied the pain of a property crash in the recession-hit country. Inspired by Latin American human rights campaigns from the 1990s, the "escraches" - Argentine slang for denunciation - have involved protesters posting flyers and shouting slogans on the doorsteps of a number of politicians over the past fortnight. REUTERS/Eloy Alonso (SPAIN - Tags: POLITICS REAL ESTATE BUSINESS CIVIL UNREST)

A member of the Mortgage Victims' Platform (PAH) rings the doorbell in the headquarters People's Party (Partido Popular) in Gijon April 9, 2013. Spanish protesters seeking to stop a wave of evictions have resorted to embarrassing politicians at their homes over harsh mortgage laws that have multiplied the pain of a property crash in the recession-hit country. Inspired by Latin American human rights campaigns from the 1990s, the "escraches" - Argentine slang for denunciation - have involved protesters posting flyers and shouting slogans on the doorsteps of a number of politicians over the past fortnight. REUTERS/Eloy Alonso (SPAIN - Tags: POLITICS REAL ESTATE BUSINESS CIVIL UNREST)

Maricela Marquez, volunteer of the Community Coalition of South Los Angeles, rings a doorbell while working on a get-out-the-vote push urging a yes on Proposition 30 vote in Los Angeles, California, November 5, 2012. REUTERS/Jonathan Alcorn (UNITED STATES - Tags: POLITICS ELECTIONS USA PRESIDENTIAL ELECTION)

Francisco of the Spanish company El Cobrador del Frac (The Debt Collector in Top Hat and Tails) rings the doorbell of a house in Pozuelo de Alarcon, outside Madrid July 4, 2012. The company specialises in sending men dressed in tailcoats to make debtors pay up. REUTERS/Andrea Comas (SPAIN - Tags: BUSINESS SOCIETY)

Firefighters Thomas Eickelberger (L) and Todd Schlenk work at a phone bank urging voters to vote against a bill that limits collective bargaining rights for public safety in Hamilton, Ohio, October 20, 2011. An army of Ohio public employees have vowed to work phone banks and ring doorbells through election day on November 8 to fight a law which bans public worker strikes and so limits union negotiating power that opponents say it reduces "collective bargaining" to "collective begging. Photo taken October 20, 2011. REUTERS/Mary Wisniewski (UNITED STATES - Tags: POLITICS ELECTIONS BUSINESS EMPLOYMENT)

The doorbell of Dirk Bikkembergs fashion store displays soccer player Andrea Vasa's name (bottom) in downtown Milan June 5, 2009. Soccer players may be known for their extravagant homes, but Vasa has trumped his peers by living in a somewhat unusual location -- a designer store. Since late February, 30-year-old Vasa, a defender for Milan's Brera team, has slept, washed, dressed and chilled out at Belgian menswear designer Dirk Bikkembergs' flagship store in the city's exclusive Golden Quad area. To match Reuters Life! ITALY-FOOTBALLER/
REUTERS/Alessandro Garofalo (ITALY BUSINESS SPORT SOCIETY ODDLY)

Pictures shows the doorbell panell at the headquarters of the Deutsche Industriebank IKB in the western German city of Duessseldorf December 10, 2007. The sale of troubled German bank IKB should start next month and a capital hike was not planned, German newspaper Die Welt reported. IKB, which lends to roughly one in 10 of Germany's biggest companies, nearly collapsed under the strain of losses on its investments in risky U.S. home loans but was saved by a bail-out spearheaded by KfW in August. The spiralling cost of covering potential losses at IKB, now more than 6 billion euros ($8.7 billion), has led the government to prepare to sell its stake in the lender via state development bank KfW. REUTERS/Wolfgang Rattay (GERMANY)

Picture shows the doorbell panel at the headquarters of the Deutsche Industriebank IKB in the western German city of Duesseldorf December 10, 2007. The sale of troubled German bank IKB should start next month and a capital hike was not planned, German newspaper Die Welt reported. IKB, which lends to roughly one in 10 of Germany's biggest companies, nearly collapsed under the strain of losses on its investments in risky U.S. home loans but was saved by a bail-out spearheaded by KfW in August. The spiralling cost of covering potential losses at IKB, now more than 6 billion euros ($8.7 billion), has led the government to prepare to sell its stake in the lender via state development bank KfW. REUTERS/Wolfgang Rattay (GERMANY)

Picture shows the doorbell panel at the headquarters of the Deutsche Industriebank IKB in the western German city of Duesseldorf December 10, 2007. The sale of troubled German bank IKB should start next month and a capital hike was not planned, German newspaper Die Welt reported. IKB, which lends to roughly one in 10 of Germany's biggest companies, nearly collapsed under the strain of losses on its investments in risky U.S. home loans but was saved by a bail-out spearheaded by KfW in August. The spiralling cost of covering potential losses at IKB, now more than 6 billion euros ($8.7 billion), has led the government to prepare to sell its stake in the lender via state development bank KfW. REUTERS/Wolfgang Rattay (GERMANY)

A woman and her daughters ring the doorbell at an illegal foster home in Antigua, Guatemala August 13, 2007. On Saturday, authorities arrested two women after finding 46 babies, some just three days old, in the home in the tourist city, many without proper paperwork. A judge has ordered the babies, ranging from 3 days-old to 2-years, be relocated to government custody until officials can determine what is to be done with them. REUTERS/Daniel LeClair (GUATEMALA)

An unidentified tourist inspects the main entrance of the house where Pope Benedict XVI was born with a sign reading 'Private' in the Bavarian village of Marktl, August 21, 2005. Claudia Dandl who lives in the house where Pope Benedict was born is selling-up after hordes of tourists peering through her windows and ringing her doorbell have made her life unbearable. Since Joseph Ratzinger, who was born in the house in 1927, became Pope in April, Dandl has had to disconnect the bell and keep the curtains drawn to try and shield her privacy from prying pilgrims. Prospective buyers have until Monday midnight to make their offers a spokesman of Dandl said.

An unidentified tourist inspects the house where newly elected Pope Benedict was born in the Bavarian village of Marktl. An unidentified tourist inspects the main entrance of the house where Pope Benedict was born with a sign reading 'Private' in the Bavarian village of Marktl, August 21, 2005. Claudia Dandl who lives in the house where Pope Benedict was born is selling-up after hordes of tourists peering through her windows and ringing her doorbell have made her life unbearable. Since Joseph Ratzinger, who was born in the house in 1927, became Pope in April, Dandl has had to disconnect the bell and keep the curtains drawn to try and shield her privacy from prying pilgrims. Prospective buyers have until Monday midnight to make their offers a spokesman of Dandl said. REUTERS/Alexandra Winkler

Tourists visit the house where Pope Benedict was born in the Bavarian village of Marktl, August 21, 2005. Claudia Dandl who lives in the house where Pope Benedict was born is selling-up after hordes of tourists peering through her windows and ringing her doorbell have made her life unbearable. Since Joseph Ratzinger, who was born in the house in 1927, became Pope in April, Dandl has had to disconnect the bell and keep the curtains drawn to try and shield her privacy from prying pilgrims. Prospective buyers have until Monday midnight to make their offers a spokesman of Dandl said. REUTERS/Alexandra Winkler AX/AA

Tourists visit the house where Pope Benedict XVI was born in the Bavarian village of Marktl, August 21, 2005. Claudia Dandl who lives in the house where Pope Benedict was born is selling-up after hordes of tourists peering through her windows and ringing her doorbell have made her life unbearable. Since Joseph Ratzinger, who was born in the house in 1927, became Pope in April, Dandl has had to disconnect the bell and keep the curtains drawn to try and shield her privacy from prying pilgrims. Prospective buyers have until Monday midnight to make their offers a spokesman of Dandl said.

-PHOTOTAKEN 06MAR05- The doorbells of an empty apartment building are seen in the eastern German city of Schwedt, March 6, 2005. Demolition crews enjoy a thriving business in depressed Schwedt, where thousands of abandoned apartments are being torn down to prevent the shrinking eastern German city from looking like a ghost town. Depopulation and de-industrialisation are plaguing regions throughout the former communist east, where an ever-worsening shortage of jobs after reunification prompted a mass exodus, with young people and skilled workers leading the way. Picture taken March 6, 2005.

-PHOTO TAKEN 06MAR05 - The doorbells of an empty apartment building are seen in the eastern German city of Schwedt, March 6, 2005. Demolition crews enjoy a thriving business in depressed Schwedt, where thousands of abandoned apartments are being torn down to prevent the shrinking eastern German city from looking like a ghost town. Depopulation and de-industrialisation are plaguing regions throughout the former communist east, where an ever-worsening shortage of jobs after reunification prompted a mass exodus, with young people and skilled workers leading the way. Picture taken March 6, 2005.

TO MATCH FEATURE GERMANY DEPOPULATION BY ERIK KIRSCHBAUM - The doorbells of an empty apartment building are seen in the eastern German city of Schwedt, March 6, 2005. Demolition crews enjoy a thriving business in depressed Schwedt, where thousands of abandoned apartments are being torn down to prevent the shrinking eastern German city from looking like a ghost town. Depopulation and de-industrialisation are plaguing regions throughout the former communist east, where an ever-worsening shortage of jobs after reunification prompted a mass exodus, with young people and skilled workers leading the way. Picture taken March 6, 2005. REUTERS/Michael Dalder MAD/GB

TO MATCH FEATURE GERMANY DEPOPULATION BY ERIK KIRSCHBAUM The doorbells of an empty apartment building are seen in the eastern German city of Schwedt, March 6, 2005. Demolition crews enjoy a thriving business in depressed Schwedt, where thousands of abandoned apartments are being torn down to prevent the shrinking eastern German city from looking like a ghost town. Depopulation and de-industrialisation are plaguing regions throughout the former communist east, where an ever-worsening shortage of jobs after reunification prompted a mass exodus, with young people and skilled workers leading the way. Picture taken March 6, 2005. REUTERS/Michael Dalder MAD/GB

The White House is pictured in Washington D.C., two days ahead of the presidential election October 31, 2004. REUTERS/John Pryke JDP

An ArrowVision representative demonstrates the Shepherd 230 Fingerprint Door Lock, during the Consumer Electronics Show in Las Vegas, Nevada, January 9, 2004. The lock incorporates a doorbell and can be operated by remote control. The door can also be operated with a standard key in case the batteries in the lock run out. REUTERS/Steve Marcus PP04010040 SM

Lien Chan, chairman of the main opposition Nationalist Party, rigns the doorbell of the Taipei District Court before filing a lawsuit for libel against President Chen Shui-bian on January 2, 2004. Lien, also a presidential candidate, said Chen and his Democratic Progressive Party had wrongly accused him of accumulating personal assets of T$20 billion ($588 million). Lien told a news conference his assets is only worth T$1.3 billion. REUTERS/Simon Kwong AH/DL

Rhode Island state police investigators wait at the front door of
nightclub co-owner Michael Derderian's home after ringing the doorbell,
February 24, 2003 in Narragansett, Rhode Island. According to
neighbors, state police searched the home for two hours the night
before as they investigated the fire at Derderian's nightclub "The
Station," which killed at least 97 people and injured 187. REUTERS/Jim
Bourg

JRB/HB

Rhode Island state police investigators wait at the front door of
nightclub co-owner Michael Derderian's home after ringing the doorbell,
February 24, 2003 in Narragansett, Rhode Island. According to
neighbors, state police searched the home for two hours the night
before as they investigated the fire at Derderian's nightclub "The
Station," which killed at least 97 people and injured 187. REUTERS/Jim
Bourg

JRB/HB

A reporter repeatedly rings the front doorbell of software company
Ptech Inc. as the main lobby sits locked and empty after a U.S. Customs
Service raid on the company's corporate headquarters, December 6, 2002
in the Boston suburb of Quincy, Massachusetts. Media reports said that
the U.S. government was investigating possible links between al Qaeda
and Ptech, which is a software contractor for the FBI, the U.S.
Department of Energy, the U.S. Navy and NATO. REUTERS/Jim Bourg

JRB/HB

Bank of England Governor Edward George waits on the doorstep at Bute
house in Edinburgh January 14, 2002, after having rung the doorbell
several times. George was in Edinburgh to meet with Scottish First
Minister Jack McConnel to discuss a range of issues affecting the
Scottish economy. REUTERS/David Cheskin/Pool

DC/PS

Microsoft employee Aaron Woodman electronically rings a doorbell using a touch-sensitive computer screen at the entry to the new Microsoft Home of the Future located at Microsoft's main campus in Redmond, March 2. Located above the screen is an iris scanner which identifies the visitor at the door by scanning that person's eye and notifying the homeowner inside of their identity. Numerous examples of computer controlled and operated home appliances and devices Microsoft believes will become commonplace within the next five years are on display at the experimental house. apb/Photo by Anthony P.

APB/HB

Chancellor of the Exchequer Kenneth Clarke rings the doorbell on his arrival at the Prime Minister's official residence Chequers January 27. The Cabinet are meeting at Chequers to finalise the Conservative party's manifesto for the forthcoming General Election.

BRITAIN POLITICS