Caline CP-520 Wah/Volume Pedal, a versatile and compact unit that allows you to control both wah and volume effects. When the red LED light is on, the pedal acts as a volume pedal. Pressing down firmly again will activate the wah effect, indicated by the green LED light. In addition to the wah effect, the pedal also features a volume control dial, allowing you to adjust the overall output volume of your signal. This gives you the flexibility to boost or cut the volume level as needed. To control the wah effect, simply rock the pedal back and forth with your foot. The toe-down position typically controls the low frequencies, creating the classic "wah" sound, while the heel-down position controls the high frequencies. Feel free to experiment with different foot movements to find your desired wah tones. Another important feature is the True Bypass functionality. When the pedal is bypassed, your signal passes through it in an unaltered state. This ensures that your original sound remains intact. Use 9V center negative Adapter (not included).