Elementary POS is able to fully run on your Android phone or tablet. However, if you are looking for a device that can also serve as a payment terminal and a printer, MyPOS Carbon might be the correct choice.
Especially if you are running Elementary POS on various devices, you can combine MyPOS Carbon as one of your cash registers with more Android phone ones. Or, you can run your cash register on MyPOS and connect other devices (phones, tablets) as a customer display or order display.
It has a very sturdy design, made to resist falls, moisture and dust. It also contains a 3G/4G SIM card slot, a Wi-Fi and Bluetooth connection.
MyPOS Carbon contains the MyPOS market application store, where you can easily download Elementary POS.