Sound Hunter Guitar Transducer Pickup Piezo Pickup for Acoustic Guitar Ukulele Violin Viola Erhu Instrument Accessory Replacement Features: No need to pinch hole on instrument, just stick the transducer pickup with the strong glue included. PU leather wrapped tail can be fixed on guitar via reserved screw hole, easy to install. With the tail interface, 6.35mm plug is available for transferring and pure instrument sound. Widely applicable for acoustic guitar, classic guitar, ukulele, erhu, violin, cello and more music instruments. Easy to install, great for daily instrument playing pickup, good assistant for music player. Specifications: Brand: Sound Hunter Main Material: Plastic Color: Red Power Supply: Button cell 3V(Not included) Package Size: 18 * 12 * 2.3cm / 7.09 * 4.72 * 0.91in Package Weight: 85g / 3.0oz Packing List: 1 * Guitar Transducer Pickup 2 * Glue Patches 1 * User Manual