Feature: 1. With bass adjustment function and treble adjustment function, you can adjust the treble and bass according to your own preferences. 2. Built-in Bluetooth system, you can play with the transmitter and receiver, or play music through Bluetooth, which is more convenient for practice. 3. Can be used for electric guitars, electric basses, electronic organs, folk guitars with pickups, ukuleles, etc. 4. With reverberation delay effect function, it can give you a different listening experience. 5. Small size, easy to carry and store, convenient to use and with good performance. Specification: Item Type: Guitar Wireless SystemFrequency Range: UHF Frequency Broadband: 20Hz-20kHz Transmission Delay: Less than 4 milliseconds Bluetooth Version: 5.0 Bluetooth Charging Port: Micro USB |Charging Time: 2h Use Time: 4h Material: Electronics + plastic + brass Battery: 400mah lithium battery. Package List: 1 x Transmitter1 x Receiver1 x Data Line1 x User Manual