Barely used, in Great working condition. Must use with the power cable, battery power is not functional. Recently used it at a gig and sounds and works great. Integrated Sound Engine, 6 Hour Battery Life Get out in front of the band with the Roland AX-Synth Remote Keyboard. This lightweight shoulder keyboard uses its own sound engine loaded with Roland's legendary solo sound arsenal. Long gigs are no worry with the 6 hour battery life. Add emotion to your performance with the modulation bar knobs and assignable D Beam Controller. Connect your AX-Synth to your computer with the USB port.