sure, here:

- tougher than phone/tablet. Phone dropped on the tiled floor is likely to die instantly. Our device is designed to survive everyday intense use and drops on the floor also. 

- cheaper than phone/tablet. Usual phone/tablet costs few hundred bucks, our device on mass scale will be definitely cheaper than that. Maybe a noname chinese tablet will match on price, but then again what about reliability?

- simpler than phone/tablet. Phone app needs some basic understanding to operate. Cheap cashier employees hired by small corner shops might find this a challenge.

- safer than phone/tablet. No option to install random apps on it. And no temptation to steal it from the counter.