Nady TS-30 Tube Sound Overdrive Pedal &ndash; Drive, Tone and Level controls - All Metal Casing &ndash; 9V battery operation or use optional AC adapter Classic design emulates the popular and musical sound of tube distortion The warmest, most natural overdrive sounds; perfect for all styles from blues to rock to heavy metal Most versatile and best sounding distortion available; Drive, Tone, and Level knobs offer optimum control All-metal casing for years of roadworthy reliability Operates with one 9V battery or the optional PAD-1 AC adapter