Features: Fit for guitar / ukulele / violin resonance box vocal musical instruments. The pickup anti-disturb, has good effect on picking up, can make less noise. Independent microphone, volume & tone controls. The active pickup can more effectively restore the real sound quality, ensuring the uniform picking-up of every string, without sound breaking, letting you enjoy wonderful music. The plug of the pickup piezo rod is welded with seamless copper tube, which has higher reliability. Fully shielded signal transmission can effectively reduce noise. Comes with a nylon battery bag for convenient battery replacement. Power supply is from external 9V alkaline battery. Specifications: Brand: Sound Hunter Pickup Input Impedance: 40M Ohms Output Impedance: 1K Ohms Current Drain: 2.1mA Tone Control Range: 10dB at 10KHz Mix Knob: Adjust C-Mic Level Endpin Size: 13mm diameter, 59mm length Connecting Cable Size: Battery cable length: 435mm; Output cable length: 553mm Plug Size: 2.5mm Power Supply: Compatible with 9V alkaline battery (not included) Piezo Size: Cable length: 320mm; Working part length: 95mm Pickup Size: 5.8 * 1.4 * 6.4cm / 2.3 * 0.6 * 2.5inch Pickup Weight: 46g / 1.6oz Package Size: 20 * 14 * 4cm / 7.9 * 5.5 * 1.6inch Package Weight:137g / 4.8oz Packing List: 1 * Guitar Pickup 1 * Pickup Piezo Rod 2 * Double Sided Tape 1 * T-shaped Accessory 1 * Nylon Battery Bag Note: Battery is not included in the package.