Features: High-quality pickup system for acoustic guitar. With blend, bass, contour and treble control sliders, 250Hz-10kHz 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. Specifications: Material: Plastic Control Range: Bass -- ±12dB Treble -- ±12dB Contour -- ±12dB Blend -- Mic & Pickup Power Supply: 1 * 9V Battery (not included) Item Size: 11 * 6.5cm / 4.3 * 2.6in Item Weight: 132g / 4.7oz Note: Battery is not included. Package List: 1 * Guitar Pickup System