The resonance pickup can enhance the vibration of the guitar and boost the effects of delay, chorus, tone and reverb to make the better performance of the guitar. Features: The guitar resonance pickup is specially designed for acoustic guitar. Independent adjustment for microphone and volume allows sound pickup and control more accurate. Premium vibration unit adds to the the guitar's volume, enhancing effects of delay, chorus, tone and reverb. With LED screen, the working state will be indicated clearly to make the operation more user-friendly. Convenient and fast installation experience together with complete fittings. Specifications: Material: Plastic + Metal Color: Black Power Supply: 18650 battery, 3.7V/2600mAh(Not included) Package Size: 25.5 * 18 * 5cm / 10 * 7 * 2in Package Weight: 248g / 8.7oz Note: The battery is Not included. Package List: 1 * Resonance Pickup 1 * Transducer 1 * Battery Compartment 1 * Metallic Wire 4 * Screw