The LoopPay system comes with two devices: the ChargeCase, which has a magnetic loop that works with credit card terminals, and a separate Fob that scans your credit cards and can be used as a second way to make credit card payments, too.
It also a battery with enough capacity to recharge 60% of an iPhone's battery. It charges via Micro USB, but has a pop-out Lightning dongle for iPhone.
Press a button on the side of the ChargeCase, and you can make an instant payment with a scanned-in default card. You can also tell the case to turn off payments after just a few minutes, or several hours.
The LoopPay Fob plugs into the headphone jack like a Square credit-card reader. It has its own battery and can be separately authorized to make payments. It's sold separately for $39, and works with both Android and iOS.
Scanning in credit cards to the LoopWallet app. Credit card information is encrypted and paired with an individual phone, and phone number and attached LoopPay accessory.
A rubber covering on the Fob can turn it into a keychain-type gadget. Its own transaction button can ping credit-card readers if you want it to, in case you want to give it to a waiter to pay.