Features: Pickup, equalizer, tuner, 3 in 1 equipment, convenient to connect the sound to the guitar speaker amplifier output. The pickup bar receives the vibration when playing, the equalizer receives, processes and adjusts the audio signal, and the output end is connected to the audio equipment to output the audio. Tuner: to obtain and determine the vibrational frequency of the sound input to the equalizer. The LED display and three signal lights show the accuracy and deviation of the corresponding scale and tone. Built-in tuner with LED display, bass, middle.1, middle.2, treble and presence control knobs, fit your different needs. Powered by one 9V battery and with low battery indicator (battery is not included). Sensitive piezoelectric sensors can collect sound quickly. Easy to install and operate, you can choose to install it in your preferred place. There are cushioning sponges behind the equalizer and output, to prevent the guitar and equalizer from bumping into each other. Stylish appearance, compact design, no feedback, suitable for acoustic guitars, suitable for small shows, party, etc. Specifications: Condition:Brand New Material: Metal+Plastic Weight: Approx. 133g / 4.7oz Color: Black Pick-up: Piezo Ceramic Pick-up Input Impedance: 10M Frequency Response: 20Hz-20KHz Control Range: Bass: (+/-)12dB at 60Hz, Middle.1: (+/-)12dB at 450Hz, Middle.2: (+/-)12dB at 2KHz, Treble: (+/-)12dB at 3.5KHz, Presence: (+/-)12dB at 10KHz Output Jack: 6.35mm & XLR Output Jacks Power Supply: 1 * 9V Battery(Not Included) Size: Approx. 7.6 * 4.6 * 2.5cm / 3 * 1.8 * 1.0in(Equalizer), 5.5 * 4.5 * 5.5cm / 2.2 * 1.8 * 2.2in(Battery Box) Package list: 1 * Equalizer 1 * Battery Box 1 * Pickup Bar 1 * Glue Cushion 1 * Plastic Tie 8 * Screw Battery is not included. Package List 1Pickup, equalizer, tuner, 3 in 1 equipment, convenient to connect the sound to the guitar speaker amplifier output. 2The pickup bar receives the vibration when playing, the equalizer receives, processes and adjusts the audio signal, and the output end is connected to the audio equipment to output the audio. 3Tuner: to obtain and determine the vibrational frequency of the sound input to the equalizer. The LED display and three signal lights show the accuracy and deviation of the corresponding scale and tone. 4Built-in tuner with LED display, bass, middle.1, middle.2, treble and presence control knobs, fit your different needs. 5Powered by one 9V battery and with low battery indicator (battery is not included).