Bluetooth-compatible wireless guitar & bass amplifier USB rechargeable and multi-functional. Also functions as a Bluetooth speaker when connected to a smartphone. - Brand: NUX - Model Name: MIGHTY AIR - Features: Bluetooth compatible, wireless guitar, drum style, USB charging Purchased new and only charged once initially, so I don't think the battery has been used much. It has been stored in a rack, and I am selling it because I have no opportunity to use it. Includes: Main unit, transmitter, instruction manual, cable (unused) Thank you for looking. Thank you very much. A modeling amplifier equipped with wireless functionality and a rechargeable battery, allowing you to play without connecting cables. It also supports Bluetooth connection, allowing you to play audio from your smartphone, and you can control the amplifier with your smartphone using a dedicated app. Recommended for practice at home, as well as for carrying around for warm-up before a live performance. * Settings are required using the app when used with a bass guitar.