[jannes]

I think you could, but you wouldn't leave your phone in the shop for other employees to use. You would have to buy a dedicated phone for the purpose... At that point you can also buy a dedicated calculator instead.

[elicash]

Many people have an old phone they could wipe, however. Even a brand new phone for this purpose would be cheaper than this smart device.

Still very cool and there are UX benefits to this device.

[abdullahkhalids]

This device is for 40 USD. What phones can you buy at this price point that provide the same latency, reliability, and big keys you can smash, as this device?

[elicash]

I did the conversion wrong! My mistake!