Item Type: Violin Pickup Set Material: Plastic, Metal Colour: Black Battery: 1 x 9V battery (delivery without battery) Tone Control: 12dB Features: Passive Frequency Response: 20Hz-20KHz Package List 1 x Battery Box 1 x Violin Pickup 1 x Pickup Strip 1 x Black Long Accessory 1 x Gasket 2 x Coil 14 x Screw 1 x Hole Piece 1SOUND QUALITY ENHANCEMENT: Use this pickup to enhance the sound quality of your violin, there will be no noise, allowing a perfect show. 2PASSIVE TONE: With this pickup with passive tone system, you can unleash your violin sound perfectly for the best performance. 3STANDARD JACK: The pickup has standard 6.35mm output and 3.5mm headphone jack, easy for connection. 4PREMIUM MATERIALS: The pickup is composed of premium plastic and metal materials, ensure excellent performance of the violin, with great stability. 5EASY CARRYING: The pickup is easy to install on your violin, compact in size, easy to carry, you can take around wherever you are.