The WAH-I is a multi-functional pedal with both a wow pedal and voluminous control. In Volume Control Mode, one features a minimalistic voluminous control, this knob allows you to adjust the volume while pedaling operations. The ergonomic design and non-slip rubber make it comfortable to operate and durable, and the LED on the side allows you to judge the status of the pedals at a glance. Size: Approximately 5.9 x 2.4 x 2.0 inches (15 x 6 x 5 cm); Designed to fit the size of the effector. Compact body weighs 15.9 oz (420 g), making it easy to carry, and does not interfere with space of the pedalboard. You can switch between WAH/BYPASS and WAH/VOL with one switch. The LED lights up in the effect on state, so your feet can be seen even on stage. True bypass in wow mode. Active voluminous control circuitry minimizes signal loss and ensures sound quality
Does not work with 9V batteries. Separate 9V center negative adapter is required