Features: This guitar active soundhole pickup is suitable for classic & folk guitars with sound hole of 88-105mm, easy installation. Dual pickup system-magnetic and microphone, and the volume of pickup and microphone can be adjusted separately. Magnetic is to collect the sound from the strings while you are playing the guitar. The microphone is for collecting the sound when you are tapping the guitar. Features rich, warm ton and wonderful response of the middle and bass, offers the best experience of tapping. Specifications: Color: Black Material: Plastic + Metal Power Supply: 1 * CR2032 battery (Not Included) Item Size: 10.1 * 2.3 * 3.1cm / 4 * 0.9 * 1.2in Item Weight: 150g / 5.3oz Package Size: 19 * 13 * 6cm / 7.5 * 5.1 * 2.4in Package Weight: 350g / 12.3oz Package List: 1 * Pickup 1 * Endpin Jack Holder 2 * Cable Holder 2 * Screw 1 * User Manual (English)