Three reverb modes: Studio/ Church/ Plate Studio: warm & natural indoor reverb, and the decay knob can show different sizes of indoor reverb effects Church: church reverb, empty and smooth natural reflex reverberation Plate: plate reverb, let the steel or gold tinsel vibrate and get the man-made mixed sound by referring to the vibration frequency. Full metal shell. Very small and exquisite. True bypass. Requires DC 9V Adapter power supply. Specifications Studio Mode: Warm & natural indoor reverb, and the decay knob can show different sizes of indoor reverb effects Church Mode: Church reverb, empty and smooth natural reflex reverberation Plate Mode: Plate reverb, let the steel or gold tinsel vibrate and get the man-made mixed sound by referring to the vibration frequency Full small and exquisite metal shell True bypass