DOUBLY GOOD: Route two input signal to two outputs. Each input signal is independent with its own level control for the perfect mix. Separate footswitches allow you to turn on or off each output source in any combination. Two guitarists can play at the same time into 1 or 2 amps! Use to mix down a CD and MP3 player to mixer! Route two keyboards to a monitor and the PA. You’ll find dozens of uses for this unique device. Dual level controls, output LED indication, Runs off 1 9V battery or optional 9V adapter. Cold rolled steel housing.