Cherub GS-3 4 Band EQ Equalizer Features: GS-3 is an acoustic guitar onboard preamp that has 4 band EQ, Phase Reversal and a built-in chromatic tuner with high definition LCD display. It has Low Battery alert to remind you to change new batteries. GS-3 is easy to be installed into a guitar and its size is only 55mm*92mm*33mm. Parameters: 4 Band EQ with Phase and LCD Chromatic Tuner Input impedance: 10M Frequency Response: 20Hz~20KHz Control Range: Ba: +/-12dB at 100Hz Middle: +/-12dB at 800Hz High: +/-12dB at 3KHz Presence: +/-12dB at 10KHz Low battery check LED Battery life: over 100hour Power supply: 9V Alkaline Battery (not included) Pick-up: Piezo ceramic pick-up Output Jack: 6.35mm Dimension: 55mm* 92mm* 33mm Package Included: 1 x G-tone EQ ( No Battery ) 1 x Manual Note: you can pay by now . More countries in the future. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store