The Apple PoS system prints customers receipts wirelessly to stationed printers throughout the retail stores (like at Apple stores) and apparently some employees are wearing mini-printers on their belts. According to some Old Navy employees the Apple POS system is perfect for the holiday sales rush as the devices portability cuts down lines and is simply more efficient for everyone.
A Gap. Inc. spokeswomen confirmed this saying:
I can confirm that we are piloting Apple's iPod based POS system at a few of our Old Navy stores.
Apple's system was detailed back in November of 2009 by AppleInsider:
Apple's solution consists of a hard plastic, two-piece slip-on shell with a grip texture. The magstripe reader is tucked onto the back of the shell, and the barcode scanner is installed within the top of the device. Hidden inside the shell is a rechargeable battery to power the card reader and scanner. A set of four tiny lights on the back indicate the unit's state of battery charge.
Buttons on the side of the device connect through to the iPod touch, including the sleep and volume controls. A mini-USB connector connects to an AC battery charger. A large squeeze-button on the right side momentarily activates the barcode scanner.