I use an 8bitdo pro 2. Over kill, probably but it works with lots of devices. Phone, switch, computer.

This video says it’s possible to make it look like a human wrote it.

They will run off both a 14500 lithium battery or a standard AA battery. Although the output is much worse with a standard AA.

I always use the lithium ion battery. Amazon has a light and battery combo for 30$ usd.