The Kill Switch Plus is a multi-function accessory. 1 in, 2 out for easy signal splitting. Want your rig silent for in between songs? Step on the footswitch and instantly mute both outputs. Tuner out stays always-on to allow muting both outputs while you silently tune. And on top of that, it has a buffer for the end of your pedal board. Runs on a 9V battery or DC-IN and all at affordable pricing.