Features: Crafted with precision and attention to detail our silent violin pickup is perfect accessory for any violinist. headphone jack provides a convenient way to listen to your playing without any external noise interference. Its sleek and compact design ensures a integration with your instrument. adjustable volume control allows you to fine-tune sound to your liking while built-in equalizer ensures that every note is crisp and clear. Noiseless and high sensitivity perfect for practice and performance musicians and students. Silent Violin Pickup can be used with a wide of violins making it a -have for every violinist. Whether you are a professional musician or a beginner this pickup will enhance your practice sessions and help you reach new levels of performance. Powered by a 9V battery(not included). Specifications: Material: ABS+metal Total Volume: 0-12 Tone: 100Hz-6.02KHz Earphone Output Socket: 3.5mm Output Socket: 6.35mm Mainboard Size: 115 * 53 * 21mm / 4.53 * 2.09 * 0.83in Battery Compartment Size: 72 * 38 * 23mm / 2.83 * 1.50 * 0.91in Item Weight: 116g / 4.11oz Package Weight: 120g / 4.23oz Package Size: 13 * 10.5 * 3cm / 5.12 * 4.13 * 1.18in Package List: 1 * Mainboard 1 * Battery Compartment 1 * Pickup Stick 2 * Knob Cap 10 * Screw