IdiotBox Death Ray Frequency Mangler Fuzz Effect Pedal 4.7 x 3.7 x 1.18 acid etched enclosure, true bypass switching, common 9v center negative BOSS style power input and battery snap. Power supply not included. Its like plugging your guitar into a fuzzed out Atari The -Z knob controls the main pitch of the square wave divider while the -A knob kind of slews the pitch so to speak This pedal can go from a high filtered squelchy fuzz to a low buzzed out bit crushy mess!