The MixIt2 is a four channel audio mixer and amplifier designed for motorcycle applications. It provides four inputs for connecting and combining signals from radar detectors, radios, cd players, MP3 players, XM receivers, talking GPS’s, CB’s, FRS radios, cell phones, etc. Power is supplied by an internal 9V battery (lasts about 25 hrs) or a filtered 12V external power jack that provides clean, noise-free listening. The MixIt2 prevents feedback damage when using multiple audio sources and the internal amplifier helps portable music players sound louder, cleaner and better. Features include a power/volume control knob, two stereo inputs, two isolated mono inputs that do not require special cables for Garmin GPS and Escort radar detectors, an output jack, and ‘power on’ and ‘battery low’ indicator LEDs. MixIt2’s volume control allows you to mute all devices simultaneously, which is handy when with friends, in urban situations or at toll booths. 5.5"×2.5"×1", 5.5 oz.