Acoustic Guitar Bass Treble Tone and Volume Control EQ Equalizer Preamp Piezo Pickup Tuner Amplifier with Active Line 6.35MM Plug Features: This equalizer preamp helps to adjust the tone and volume of your guitar. You can spend less time tweaking controls and more time playing. You can control bass, treble and volume. Low battery signal, the low batt will light when it is in low power condition. 1 pick to amplify the sound. 1 small sticky plate helps to fix the power leads. 4 mounting screws connect the guitar firmly. Connecting wire with 6.35mm plug. Powered by 9V Alkaline battery (not included). Specifications:   Bass: +/-12dB at 100Hz Treble: +/-12dB at 10KHz Power: 9V AIkaline battery Battery Life: Over 350 hours             Pick﹣up: UK-2000（Piezo cable pick-up）                         Item color: Black Item size: 6 * 4 * 5cm / 2.4 * 1.6 * 2in Item weight: 58g / 2oz Package size: Approx. 11 * 7 * 6cm / 4.3 * 2.8 * 2.4in Package weight: 76g / 2.7oz Package list: 1 * EQ 1 * Connecting Cable 1 * pick 4 * Mounting Screws 1 * Screw Cap 1 * Metal Washer 1 * Sticky Plate 1 * Cable Tie Note: The batteries are not included.