Cherub GT Series Acoustic Guitar Preamp GT-3 4-Band EQ with Piezoceramic Pick-UpGT-3 4-Band EQ with Notch Tuner and TunerThe GT-3 is a 4-band EQ with chromatic tuner, top-level feedback-fighting and phase effect. The visible part of the GT-3 is only 52mm x 54mm x 4mm. , Low battery will display when the battery is low. High-resolution LED display. Features: 4 band EQ/chromatic tuner/feedback-fight cutout/phase filterInput impedance: 10M ohmsFrequency response: 20Hz 20KHzAdjustable range: low: +/- 12dB at 100Hz mid: +/- 12dB at 800Hz high: +/- 12dB at 4KHz brilliance: +/- 12dB at 10KHzLow battery check LEDBattery life: over 100 hoursPower supply: 9V alkaline batteryReception: piezoceramic receptionOutput jack: 6.35mm Color: blackMaterial: plastic + electronicContent Packaging:1 * Corrector1 * Battery Packing1 * Piezo Cable2 * Hole Template8 * Mounting ScrewOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.