Ampeg Opto Comp, Effects Pedal, Analog bass compressor, Controllers for compression, release and output levels, True bypass, Power supply with 9 V battery or 9 V power supply (both not included, suitable battery available under Article Nr. #132579#, suitable power supply under Article Nr. #409939#), Dimensions: 11.4 x 6.6 x 5.6 cm, Weight: 272 g