Donner Wah Cry 2 in 1 Mini Guitar Wah Effect/Volume Pedal True Bypass 2 in 1 pedal (WAH/volume). Multi-functional pedal with extremely mini size Adjustable control range (bottom value) Active volume mode will keep lossless tone. The response is based on the original Crybaby response Working current: 15 mA. Power Supply: 9V AC adapter (Tip Negative)True bypass