The AirCash unit is an automatic cash drawer trigger. This product is designed to be connected directly to a cash drawer, so you can remotely open the drawer without the need for an extra printer to open the cash drawer.
To set up an Aircash unit simply search for it in the same way that you would search for and setup up a printer.
This product is useful if you intend to share a printer between two iPads and want to have a cash drawer for each iPad.
The aircash device requires a power outlet for operation. Bluetooth AirCash units are also available, this means the unit can 'Pair' with the iPad directly without the need to be connected to the router by a network cable.