Fangrui Product Details Electric Guitar, Bass, Electric Blowpipe, Electric Violin, Electric Drum, Electric Guzheng And Other Electroacoustic Instruments Just Plug The Transmitter Into An Electric Guitar/electric Blowpipe/electronic Keyboard And Other Electroacoustic Instruments, And The Receiver Into A Playback Device Such As A Speaker. Plug And Play, Simple To Use; Compact Size And Lightweight, Easy To Carry. Precautions For Use: 1. Before Use, Please Confirm The Transmitter And Receiver Connections (operate According To The Instructions), Make Sure That The Transmitter Is Plugged Into The Instrument And The Receiver Is Plugged Into The Speaker, Otherwise No Sound Will Be Transmitted. 2. If There Is Noise Or Intermittent Connection, It May Be Due To The Following Reasons: Insufficient Battery Power; Displacement Of The Battery Due To Transportation (you Can Open The Battery Part And Move The Battery To The Right); The Distance Is Too Far (within 15 Meters, The Effect Is Better. ); There Is A Strong Interference Source Nearby.