7-band graphic equalizer that is convenient for adjusting the sound quality of the bass or keyboard. Also active in making sounds Covers a wide frequency band of 50 Hz to 10 kHz, enabling a ±15 dB boost/cut in each band Equipped with power ON/OFF and LED status indicator Functions in bypass mode when power is off Powered by 9V or optional PSU-HSB-ALL power adapter Be sure to check the detailed product description at the bottom and precautions before purchasing! To request a return or exchange, please note that it is mandatory to provide a video of the unpacking of the package.