I have had the unit for about two months. It's flawless. I did put velcro on the bottom but will include the original "feet". $90 shipped with original box and manual. Hematoma is a two channel bass pedal consisting of a 5db preamp and an overdrive. The preamp and overdrive can be used independently or can be combined. Input-Instrument in. Unplug when not in use to conserve battery life. Out-Out to amp -9VDC jack-for use with -(Negative) center, 9VDC, filtered, and regulated power supply. Pre-Gain control-Varies the level of the pre-amp up to 5db boost. Gain control-Varies the amount of overdrive. Level control-Varies the amount of output for the overdrive channel. Tone control-Varies the amount of bass or treble for the overdrive channel. EQ-Shift switch-Changes the sweep of the tone control and provides a warmer smoother tone when engaged. (Switched to the right) BO-Switches on and off the overdrive effect. BP-Switches on and off the bass pre-amp effect.