The Wahter wah pedal features unique pressure sensing switch. Simply put your foot on the pedal, and the pressure sensor will sense your touch. Its easy-to-use design allows you to focus on the performance. Features: Classic wah tone guitar effect pedal. Unique pressure sensing switch design, easy operation. Extendable pedal rings enhances the feeling and sensitivity of your touch. Dual activation modes: sensor mode--activated by simply putting your foot on the pedal; hold mode-- activated or deactivated by quickly tapping your foot twice on the pedal. Two LED lights for indicating effects or bypass status. Full metal shell, durable and exquisite. Specifications: Material: Metal Input: 1/4" Monaural Jack (impedance: 1M ohms) Output: 1/4" Monaural Jack (impedance: 100k ohms) Power Supply: DC 9V Working Current: 50mA Item Size: 4.8 * 9.2 * 5cm / 1.9 * 3.6 * 2in Item Weight: 470g / 16.6oz Package Size: 10 * 7 * 6.5cm / 3.9 * 2.8 * 2.6in Package Weight: 521g / 1.1lb Package List: 1 * Wah Pedal 1 * Linking Tape 1 * User Manual(English) Note: Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.