High-quality pickup system for acoustic guitar. With Brillance, Bass, Contour and Treble control sliders, 250Hz-3kHz contour frequency. Supports feedback-fighting notch filter and volume control, with phase switch. Supports tuning function, with LED display showing the tuning information. Ideal for acoustic guitar players to improve the guitar sound. Control Range: Bass - 12dB Treble - 12dB Contour - 12dB Brillance - 9dB Power Supply:1 x 9V Battery (not included) Item Size:11x6.5cm\/4.3x2.6in Item Weight:128g\/4.5oz Note:Battery is not included Colour:Black Material:Plastic Package Contents: 1 * Guitar Pickup kit 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.