With this preamp, you spend less time tweaking controls and more time playing. Tone and volume control. With volume, bass, middle, treble, pres control knobs. Can be installed in the body of any standard acoustic guitar LCD display, easy to read. Powered by 6F22 9V battery(NOT included) Low battery check LED. Auto and manual tuning mode. Shape sound and eliminate feedback by 5 bands. colour:Black Material:Plastic + Metal size:74 x 55 x 37mm Package Contents: 1 x Acoustic Guitar Pickup 1 x Piezo Rod 8 x mounting screws 1 x microphone 1 x battery box 1 x Clip 1 x cable tie Only the above package content, other products are not included. Note: Light shooting 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.