Descriptions: A. and high quality B. Professional guitar and bass tuner C. LCD display D. Powered by 6F22 9V battery (no include) Low battery check LED Auto or manual tuning mode Specifications: 1. Frequency Response: 20Hz-20KHz 2. Control Range:Bass: ±12dB at 60Hz Middle: ±12dB at 500Hz Middle 2: ±12dB at 1.2KHz Treble: ±12dB at 3KHz Presence: ±12dB at 8KHz Mid2. Control: 600Hz~2KHz 3. Tuning note: Chromatic/Guitar Mode 4. Chromatic & Guitar Tuning Mode(7B/6E/5A/4D/3G/2B/1E) 5. Pick-up: Piezo Ceramic Pick-up 6. Dimension: 4.06 inch x 2.48 inch 7. Weight:200g Color: Black and Red Material: Plastic + Metal Package Contents: 1 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.