AD-35 transducer is a mini transducer pickup for acoustic guitar, violin, ukulele and other resonant box-vocal musical instrument, which makes your instrument produce clear, warm sound with excellent resonance. Features: Mini piezo pickup transducer, fits for acoustic/classical/folk guitar, ukulele, violin etc, no need for battery. It makes your instrument produce excellent sound quality while perfectly restores the sound fidelity. Easy to install, removable self-adhesive design allows you stick it anywhere on your instrument, and never cause harm to the surface of instrument. Volume level adjustable, preventing noise squeal. With 6.35mm output plug, approx. 3 meters audio cable for connection. Specifications: Material: Plastic & Metal Color: Black Suitable for: Acoustic/Classical/Folk Guitar, Violin, Ukulele etc Cable Plug: 6.35mm Cable Length: Approx. 3meters Pickup Size: 3.5 * 3.5 * 1.5cm / 1.4 * 1.4 * 0.6in Item Weight: 60g / 2.1oz Package List: 1 * Pickup(with audio cable) 4 * Self-adhesive Sticker Note: The instruments showed in the picture are not included.