Features:With this equalizer， you spend less time tweaking controls and more time playing.Shape sound， tone and volume control with 3 bands of equalization.With bass， middle， treble， mic， volume control knobs.With a microphone， provide a better way to transfer sound when playing.No need of drilling， easy to install.The battery check indicator will light when the battery energy is low.1 pick to amplify the sound.1 small sticky plate helps to fix the power leads.Active connecting wire with 6.35mm plug.Powered by 2 * 3V Lithium battery (not included). Specifications: Bass: +/-12dB at 100HzMiddle: +/-12dB at 10KHzTreble: +/-12dB at 10KHzPower: 2 * 3V Lithium battery (not included)Pick﹣up: Piezo ceramic pick-up Item color: BlackItem size: 11 * 3 * 2.5cm / 4.3 * 1.2 * 1inItem weight: 90g / 3.2ozPackage size: Approx. 12 * 7 * 5cm / 4.7 * 2.8 * 2inPackage weight: 108g / 3.8ozPackage list:1 * EQ1 * Connecting Cable1 * Pickup Line1 * Sticky Plate1 * Cable TieNote:The batteries are not included.