Vertex Boost Effect Pedal Buffered bypass, volume and clean boost pedal- all in one device - leaving your tone unchanged, while boosting the level of your signal 100 percent analog circuitry. Use BOOST as a gain booster, a level booster, or in an effects loop Total control of output level via EXP - EXP or Volume Pedal will control the boosted volume, sweeping from silent to wherever the Boost level knob is set Level is adjustable from +0dB to +16dB of available clean boost - ultra-linear buffer to condition your line with ZERO tonal coloration, even with dozens of pedals in your chain Stompbox format. Lifetime Warranty. 9VDC center-negative power operation (adapter not included). Assembled in California.