MXR M291 Dyna Comp Mini, compressor effects pedal, combines classic tone and modern convenience in a housing that's nearly half the size of the original, rare CA3080 'metal can' integrated circuit (IC) yields quieter operation, greater transparency, and increased dynamic range, true bypass, controls for Output, Sensitivity, Attack switch toggles between slow and fast attack times, bypass footswitch, status LED, metal housing, 6.3 mm mono in / output jacks, power supply via optional 9V DC adapter (Dunlop ECB 003), 2.1 x 5.5 mm barrel plug, polarity (-) center, battery operation not supported, current draw 4 mA, dimensions (L x W x H) 90 x 40 x 55 mm / 3.54"" x 1.57"" x 2.16"", weight ca. 160 g / 0.28 lbs