Features:Suitable for many kinds of acoustic instruments, such as guitar, ukulele, mandolin, banjo, etc.It is able to eliminate interfering external sounds and not be influenced by sound reflections from nearby objects.With 3 transducers, stick it onto the instrument, minimizing the damage to instrument body.Easy to install and can transmit good sound quality.Audio jack can replace the tail nail and install the strap.Specification:Condition: 100% Brand NeSMaterial: Metal + PlasticCable Length: Approx. 60cm / 23.6inJack Size: 6.35mmPickup Diameter: Approx. 3cm / 1.2inWeight: Approx. 36gPacking List:1 * Pickup Piezo1 * Cable Tie1 * BlockInstallation Method1. Remove the tail nails and widen the tail holes to the appropriate width (about 1-1.5cm in diameter)(without tail nails, find the right position to open the hole)2. Stick the patch to the position that is most acceptable for vibration, usually below the bridge3. Attach a fixing pad to the appropriate position and fix the long connecting wire to the fixing pad with a fixing strip.