Description:With this preamp you spend less time pinching controls and more playing time. Tone and volume control. With volume, bass, mid, treble control knobs. LCD display, easy to read. Powered by 6F22 9V battery (not included)Low battery check the LEDs. Automatic and manual tuning mode. Great for acoustic guitars to enhance the sound of your guitar. Specification:Material: PlasticAdjustable Range:Bass: +/-12dB at 60Hz Center: +/-12dB at 500Hz Top: +/-12dB at 3KHzPresence: +/-12dB at 10KHzPower: 6F22 9V Battery (Not Included)Size Chart:Size: Approx. 9.8x5.8x4.0cm/3.85x2.28x1.57inchPackage Included:1 Set of Guitar Pickup SystemNote:Please allow 1-3mm measurement deviation due to manual measurement. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures.