The Shopify Point of Sale App for iPad and iPhone supports a few different model thermal receipt printers with interface options that we will list here. It is important to point out that you must have the Retail Package enabled in Shopify's Admin setting area in order to use a receipt printer or other bar code equipment with your POS iPad setup. Also, Shopify POS receipt printing hardware is not currently supported for Android devices. Shopify POS Compatible Receipt Printers : Star Micronics TSP650IIBI Bluetooth Wireless Receipt Printer Model 39449871Star Micronics TSP143LAN Ethernet Receipt Printer Model 39463110Star Micronics TSP100USB USB Receipt Printer...