I can only provide a suggestion in that I have a Line 6 G10 relay ( I think) wireless thing. It's base plugs into the amp or soundboard and the transmitter plugs in to the guitar. It works extremely welll with my experiences and the transmitter size is about 2" long and 1" in diameter. It is rechargeable but holds up for at least 6 hours on my last use. Check it out ...I believe it's about $90?