Description:Application: This bass tone control system allows you to adjust the bass, middle, treble and volume, meeting your different needs. Suitable device: This preamp equalizer is suitable for active pickup and the installation is convenient and simple and is easy to use. Replacing part: This guitar bass control system has good performance and is a good choice to replace an old or damaged. Battery powered: This guitar bass tone control system is operated by a 9V battery and has a battery case to protect the battery. Wide application: This active preamp equalizer wiring harness kit can be applied on an electric guitar, bass, and piezo equipped instruments. Specification:Input impedance: 20Mw.Frequency response: 20Hz-20KHz.Bass: 12dB at 85Hz.Middle: 12dB at 800Hz.Treble: 12dB at 7KHz.Battery: 9V battery(Not included). Note:There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes:1 Piece Guitar Bass Control System.