Features: This equalizer helps to adjust the tone and volume of your guitar. You can spend less time tweaking controls and more time playing. You can adjust bass, middle, treble and volume. Wide frequency range from 20 HZ to 20 kHZ. When it is in low power, the battery check indicator will light. 1 pick to amplify the sound. 1 small sticky plate helps to fix the power leads. 4 mounting screws connect the guitar firmly. The outlet is 6.35mm. Powered by 9V Alkaline battery (not included). Specifications: Bass: +/-12dB at 60Hz Middle: +/-12dB at 500Hz Treble: +/-12dB at 10KHz Frequency Response: 20Hz - 20KHz Power: 9V AIkaline battery (not included) Pickup: Piezo ceramic pick-up Item color: Black Item size: 9.5 * 4 * 6cm / 3.7 * 1.6 * 2.4in Item weight: 111g / 3.9oz Package size: Approx. 11 * 7 * 6cm / 4.3 * 2.8 * 2.4in Package weight: 129g / 4.6oz Package List: 1 * EQ 1 * pick 4 * Mounting Screws 1 * Screw Cap 1 * Metal Washer 1 * Sticky Plate 1 * Cable Tie Note: The batteries are not included.