The 3 band equalizer is for acoustic guitar, thin body design, clear LCD display, with phase and tuner function, it will upgrade your guitar and modify the sound for more perfect performance. Features: 3 band equalizer for acoustic guitar, it helps to modify the sound. With phase and tuner function. Clear LCD display, with low battery indicator. Volume control, with bass/middle/treble knob to adjust voice frequency. Compact body, the battery box is built-in the equalizer, easier to mount it on the guitar. Powered by 9V alkaline battery(not included). Supplied with pickup line, mounting screws, sticky plate and cable tie for mounting expediently, perfect for guitar players. Specifications: Main Material: Plastic Band: 3 Input Impedance: 15MOhm Frequency Response: 20Hz---20KHz Control Range: Bass: ±12dB, Middle: ±12dB, Treble: ±12dB Pitch: 440Hz Plug Dimension: 6.35mm Power Supply: 9V Alkaline Battery(Not Included) Item Size: 8 * 4.5 * 6.5cm / 3.1 * 1.8 * 2.6in Item Weight: 108g / 3.8oz Package Size: 12 * 8.5 * 6cm / 4.7 * 3.3 * 2.4in Package Weight: 149g / 5.3oz Package List: 1 * 3 Band EQ 1 * Pickup Line 4 * Mounting Screws 1 * Sticky Plate 1 * Cable Tie Note: The battery is not included.