Features: Pickup, tuner and equalizer system for acoustic guitars. 3-band EQ (BASS, MIDDLE, TREBLE). With LCD display for showing the tuning information. With volume control knob and low battery check LED. Ideal for acoustic guitar players to improve the guitar sound. Specifications: Material: Plastic Control Range: Bass --12dB at 75Hz Middle --12dB at 750Hz Treble -- 12dB at 10KHz A4 frequency: 440HZ Tuning Range: A0(27.5Hz) - C8 (4186.01Hz) Power Supply: 1 * 9V Battery (not included) Item Size: 5 * 5 * 3cm / 2 * 2 * 1.2in; 6 * 3.5 * 5.5cm / 2.4 * 1.4 * 2.2in Item Weight: 80g / 2.8oz Package Size: 10.5 * 7 * 7cm / 4.1 * 2.8 * 2.8in Package Weight: 110g / 3.9oz Note: Battery is not included. Package List: 1 * Guitar Pick-up System