You are looking at the MXR M291 Dyna Comp Mini compressor.

The MXR M291 Dyna Comp Mini compressor effects pedal allows you to get the same tone in a pedal that takes up nearly half the pedalboard real estate as the original Dyna Comp M102. 

The Dyna Comp Mini's "metal can" CA3080 IC chip is the same as found in vintage Dyna Comps, offering a transparent tone with low noise. And you'll find an attack button to select between a slower or faster feel. 

• Dyna Comp compressor with a miniature size 
• Standard control layout of Sustain and output 
• Attack button chooses between a fast and slower attack
• "Metal can" CA3080 IC chip sounds transparent and lowers the noise floor