Description:Application: This bass sound control system allows you to adjust the bass guitar, near, treble and low volume, meeting different needs. Suitable Device: This preamp equalizer is suitable for active reception, and the installation is convenient and simple and easy to use. Parts Replacement: This bass guitar control system has good performance and is a good choice to replace the old one or damaged. Battery Powered: This bass guitar sound control system is supported by a 9V battery and has a battery case to protect the battery. Wide Application: This active preamp equalizer wiring kit can be used on instruments equipped with electric guitar, bass, and piezo. Specification: Input Impedance: 20Mw. Frequency Response: 20Hz-20KHz. Bass: 12dB at 85Hz. Mid: 12dB at 800Hz. Treble: 12dB at 7KHz. Battery: 9V Battery (Not Included). Note:There may be a little color distortion due to the different resolutions of your computer. There may be a slight error due to different manual measurements. Package Included: 1 Piece Bass Guitar Control System.