The guitar resonance pickup is specially designed for acoustic guitar. 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 be indicated clearly to make the operation more user-friendly. Convenient and fast installation experience together with complete fittings. 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. Power Supply:lithium battery battery, 3.7V/2600mAh(Not included) Due to different product batches, the appearance , which does not affect the use. Colour:Black Material:Plastic+ aluminum alloy Package Contents: 1 * Resonance Pickup Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.