A woman registers her palm on a PulseWallet, a point-of-purchase device, during the 2014 International Consumer Electronics Show (CES) in Las Vegas, Nevada, January 8, 2014. The system measures vein patterns in the palm. After confirming a person's identity, the purchase can be paid with a "digital wallet" linked to a credit card, debit card, a bank account or even paid in bit coins. REUTERS/Steve Marcus (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY)