Designed for small instruments: This piezo transducer is especially suitable for small instruments such as kalimba and other thumb pianos, and can also be used on guitars, ukuleles, violins, and more. Protect your instrument: The acoustic guitar pickup adopts a self-adhesive design, and the traceless glue not damage the lacquered panel of the instrument. Simply plug the jack into the amplifier on the instrument to easily obtain pure tone. Dimensions: This mini guitar pickup comes with 3 transducers and fits 6.35mm jacks; Cable length: 90mm/3.5 inches. Easy to carry: This piezo contact pickup is small, and easy to carry. Ideal Gift: The piezo transducer parts contact microphone receives sound through direct contact with the , which can reduce noise well and obtain cleaner sound, making it an ideal gift for music lovers. Size:Jack diameter: 6.35mm / 0.25inch Endpin Jack Length: 6.2cm/2.44inch Total length: 20cm / 7.87inch Note:No battery, No onboard electronics, Just the pure pickups. Installation instruction: 1. Take the plastic film down from the back of transducer to expose the adhesive 2. Place the transducer through the sound hole to the lower part of the front body where the guitar produces the best response 3. Drill a hole from inside the body, loosen -pin jack nut, insert it to the hole and tighten the nut Above the procedures for referring depends on different instrument Color: As Shown Material: plastic Package Contents: 1 * Pickup Transducer 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.