New and high quality. guitar and tunerWith volume, , middle, treble, pres control knobs.LCD display, easy to read. Low battery check LED.Auto and manual tuning mode. Powered by 6F22 9V battery (No Battery)Principle: the vibration of the bridge through the piezoelectric strip, drive it with 9V supply, input it to the host computer, amplify the signal through the host circuit board, and output it to the speaker. This pickup is an active pickup.1. Frequency Response: 20Hz~20KHz2. Control Range: : +/- 12dB at 60HzMiddle: +/- 12dB at 500HzMiddle 2: +/- 12dB at 1.2KHzTreble: +/- 12dB at 3KHzPresence: +/- 12dB at 8KHzMid2. Control: 600Hz~2KHz3. Tuning note: Chromatic/Guitar Mode4. Chromatic & Guitar Tuning Mode(7B/6E/5A/4D/3G/2B/1E)5. Pick-up: Piezo Ceramic Pick-upColour:blackMaterial:Plastic+MetalSize:9.8 x 5.5cmPackage Contents:1 x pickup8 x screws1 x wire 1 x pickup stick1 x battery box1 x strapOnly the above package content, other products are not included.Note: Light 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.