It's a simple one knob recreation of the classic Deluxe Reverb, like many of the classic amps with just a single reverb knob. It was specifically designed to cut through the mix and give your tone some atmosphere. Its knob is extra large so it can be easily manipulated by one's foot. There is a ton of headroom and the reverb can be made to be extremely subtle for use in front of overdriven amps without getting nasty. Using an external power supply will automatically disconnect the battery. Disconnect the input jack to preserve battery life when not in use.