Behringer UW300 features dedicated Sensitivity, Manual, Depth and Rate controls for awesome sound shaping. A cool blue status LED for effect on/off and battery check plus a first-class electronic on/off switch for highest signal integrity in bypass mode are included. The UW300 runs on a 9 V battery or a DC power supply (not included). First-class electronic On/Off switch for highest signal integrity in bypass mode High-quality components and exceptionally rugged construction ensure long life The UW300 has no on/off switch. As soon as you insert the plug into the IN connector, the UW300 is on. When not in use, remove the plug from the IN connector. This extends the life of the battery In Connector 1/4 TS; Impedance 500 k? / Out Connector 1/4 TS; Impedance 1 k? Conceived and designed by BEHRINGER Germany