FC Mobile II and Sega Digital Pocket - New Handhelds from Hyperkin.

[tofu]

You already have a working RF wireless NES controller for the FC Mobile 2. The trick would be to build a receiver for the console.

I wish we had done RF, but the price per unit would have gone up pass a certain point. We're using IR right now and it works but can be easily blocked by passing human bodies and the range is slightly over ten feet.