Piezo pickup is enough to capture sound quickly. Push the button on tuner to tone and volume as you like. Easy to install, tear off sticker and fastened to the instrument without need of drilling hole. Passive , without need for external power. It comes with an audio cable (3.5mm-6.5mm), . 3 in length, with a piece of sticker. for most stringed instrument like guitar, violin, banjo, mandolin, etc. Colour:black Material:plastic Package Contents: 1 x Pickup 1 x Volume & Tone Controller 1 x Audio Cable 1 x Sticker Only the above package content, other products 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.