1、SOUND QUALITY ENHANCEMENT: Use this pickup to enhance the sound quality of your violin, there will be no noise, allowing a perfect show. 2、PASSIVE TONE: With this pickup with passive tone system, you can unleash your violin sound perfectly for the best performance. 3、STANDARD JACK: The pickup has standard 6.35mm output and 5mm headphone jack, easy for connection. 4、PREMIUM MATERIALS: The pickup is composed of premium plastic and metal materials, ensure excellent performance of the violin, with great stability. 5、EASY CARRYING: The pickup is easy to install on your violin, compact in size, easy to carry, you can take around wherever you are. 1 x Battery Box1 x Violin Pickup1 x Pickup Strip1 x Black Long Accessory1 x Gasket2 x Coil14 x Screw1 x Hole Piece Item Type: Violin Pickup SetMaterial: Plastic, MetalColour: BlackBattery: 1 x 9V battery (delivery without battery)Tone Control: ±12dBFeatures: PassiveFrequency Response: 20Hz-20KHz