EQ 7545R pick-up equalizer system with 4 bands can be easily fitted into your acoustic guitar and it is essential to electrify and amplify their sound. Under the saddle pickup for acoustic guitar. Pre-wired for easy assembly. 4 bands plus volume control. Supplied with a battery box, Low battery indicator. Connecting wire with 2.5mm plug included. Presence Control: +/- 12dB at 8KHz Bass Control: +/- 12dB at 600Hz Middle Control: +/- 12dB at 600Hz Treble Control: +/- 12dB at 2.2KHz Frequency Response: 20Hz - 20KHz Power: 9V alkaline battery (Not included) Colour: Picture color Material: Plastic Package Contents: 3 x Guitar pickup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.