, high sensitivity and high 2 pcs piezo disc transducer into 1 output ,So that you can stick on your guitar anywhere when you to play and GolpeHas the advantage of being to eliminate interfering external sounds and not be influenced by sound reflections from nearby objectsFit for string music instruments such as Guitar Mandolin Violin Ukulele etc.Material: metal + plasticColor: blackcable long: 55cm/21.6 inchPlug Dia: 6.35mm/0.25 inchInstallation instruction: Take the plastic film down from the back of transducer to the adhesivePlace the transducer through the sound hole to the lower part of the front body where the guitar produces the best tonal responseDrill a hole from inside the body, loosen -pin nut, insert it to the hole and tighten the nutAbove the procedures for referring depends on different instrumentPackage Contents: 1 * 1 * glue block1 * Cable tieOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.