Xtenzi Brand Remote Amplifier Level Controller Optional bass remote XTBR7-91562. ^^ Optional Wired Remote Volume Control Compatible with Select MTX Thunder / WET series Amp. ^^ Controls the bass/gain from the front seat or remote location from amplifiers, without having to reach for the amplifier. ^^ Allows you to adjust your Bass Level quickly and in the Most Ideal Location, easily mounts underneath a dash for an "out-of-sight' install or simple 1-wire connection gets you up and running in a flash. ^^ High Quality Product Remote Unite comes with 5-meter (196 inch) remote connection wire and bass knob.