Control Range: Bass: +/-12dB at 60Hz Middle: +/-12dB at 500Hz Treble: +/-12dB at 3KHz Presence: +/-12dB at 10KHz With this preamp, you spend less time tweaking controls and more time playing. Tone and volume control. With volume, bass, middle, treble, pres control knobs. LCD display, easy to read. Powered by 6F22 9V battery(not Include) Low battery check LED. Auto and manual tuning mode. colour:black Material:Plastic + metal size:9.8*5.8*4cm Package Contents: 1 x 5 Band EQ Equalizer 1 x Piezo Pickup Line 8 x Mounting screws 1 x Microphone 1 x Battery box Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.