Rodenberg Killmister Auto Kill Switch; Effects Pedal for Electric Guitar; Besides the manual kill option, the pedal has an 8-step rotary switch with which you can set automatic kill times from 400ms - 100ms, the eighth step 100ms (50ms cycle) is machine gun; as long as you keep the footswitch pressed, the pedal kills in the set cycle (step 1 = manual, The sound is muted as long as the foot switch is pressed); This is a hard kill (reed relay), not a tremolo.; LED: Status LED, lights up in the kill frequency; Footswitches: Effect Bypass; Connections: Input (1/4"" Jack), Output (1/4"" Jack); Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; Current Draw: 30 mA; powered by a 9-18 V DC Power Supply (not included); suitable optional Power Supply: Item no. #409939; True Bypass; Dimensions (W x D x H): 39 x 93 x 33 mm (1,54"" x 3,66"" x 1,3""); Weight: 150 g (0,33 lbs); Handmade in Germany; Note: Battery operation is not supported