Features: Cherub GT-6 is a 3-band equalizer with built-in highly accurate chromatic tuner. It includes phase, reverb, delay, chorus, and wide effects. The compact design allows for easy installation into a guitar, with the visible portion measuring only 52mm * 54mm * 4mm. A low battery indicator is displayed when the battery is running low. Features phase and tuner functions, along with built-in reverb, delay, chorus, and wide effects. 3-band equalizer: adjust volume frequency using Low/Middle/High controls. Adjust reverb, delay, chorus, and wide effects using dedicated knobs. Wide frequency range from 20 Hz to 20 kHz. LED indicators show effect on/off status and battery level; replace the battery when the BATT light is on. Powered by a 6F22 9V alkaline battery (battery not included). Functions: 3-band EQ, chromatic tuner, phase, reverb, delay, chorus, and wide effects. Input Impedance: 10MΩ Frequency Response: 20Hz–20kHz Control Range: Low: ±12dB at 100Hz, Middle: ±12dB at 800Hz, High: ±12dB at 3kHz Low Battery Check: LED indicator Battery Life: Over 20 hours Pickup: Piezo ceramic pickup Output Jack: 6.35mm Dimensions: 5.2 x 5.4cm / 2.05 x 2.13in (W x L) Package Includes: 1 set of Cherub GT-6 3-band equalizer preamp 8 screws