I just did a quick review on these Joyo JW-03 2.4 GHz Wireless guitar system. Now remember these cost me $56.00 . Now my local shop is selling Korg for over $200. I did my research before i bought even checked out reviews on the high priced ones.
I first made sure to charge them first, seeing I don't know how long these have sitting around in a warehouse before i received them, from instructions if yellow lights are blinking , it needs to be charged, so yes they were blinking and yes i charged them fully. When fully charged lights go out. So now ready to go! I tried these out with 2 amps first my NU-X plugged in the receiver to the amp turned it on blue lights were flashing then plugged the transmitter into the guitar turned on switch bang it paired beautifully.
Started playing noticed no lag, tones were very good noticed no difference. Walking around the house, no interference, continued working throughout my house. I used in all 5 guitars including a recessed jack, no problems in connection, the plug fits snug like reviews said, i like this it doesn't flop around like some do. It also has a rubber plug on the back of the unit, so if it rests on your guitar it wont scratch this is a winner for me. You can move the unit itself around to were its comfortable for you. It feels sturdy which i like, not flimsy you know, when you grab it feels like its not a fragile piece of plastic . I like the looks of the units and it comes with blue sexy lights when they are turned on.
Also some units do not work with passive or can't remember the name pickups , these baby's do and worked very well. These are ideal for myself and i have read a review from working Pro who said he has spent hundreds of dollars on name Brands said these work well. When i get back to doing gigs again these will be with me . I will definitely use them. And being able to get rid of using another cord which you can get tangled up in. and have the freedom of moving around is an extra bonus.
Pros
easy to use, long battery life from what i have read 8 hours or possibly longer. Time will tell.
well made
connects easily
no squealing or hissing or interference of any kind.
the box the units come in is secure and small, great to put in your gig bag.
Cons
None that i could find.