Portable innovative charging box design with long deep cycle life rechargeable battery can power wireless guitar device twice and up to 6hrs working after fully charged Specially connector shape design is compatible with most all electric guitar bass 6.35mm mono jacks and those with vibrato system, multiple effect pedals or various instruments Easy to Pair. Double click the button of receiver, then double click button of transmitter for more than 2 seconds, when both indicators keep blue mean they're paired successfully 4 signal channels. The one transmitter can be simultaneously matched four receivers by one key to switch different signal channels to send audio
