Is ther any option out there for playing old school portables like the GB Pocket and Game Gear with wireless headphones or earbuds? I imagine such a solution would require a plug-in bluetooth transmitter and a matching earpiece?
https://www.google.com/search?q=3.5mm+to+bluetooth&ie=utf-8&oe=utf-8 there are universal solutions if you have an existing Bluetooth headset.