Check the listing for details. Used MXR M102 Dyna Comp Compressor Guitar Effects Pedal. Condition: Used. Listed at 84.99 USD. Used MXR M102 Dyna Comp Compressor Guitar Effects PedalMint, with all original packaging! Orders placed before 12:00 PM Eastern Standard Time will ship same day! Orders placed after 12:00 will often ship same day as well, if not, they will ship next day.International orders: Please note that you will be responsible for any applicable customs fees or import taxes!Check my feedback and bid with confidence! The Dyna Comp is a compressor that lets you set a maximum output level and the sensitivity at which it kicks in. This device can produce that percussive, clicky sound on a clean guitar that you've heard on so many pop hits. It can also even out the volume of sustained tones for mellow lead work Power: Single 9 volt battery or Dunlop ECB-003 AC adapterControls: Footswitch toggles effect on/bypass (red LED indicates on) Output knob sets compressed (attenuated) output level Sensitivity knob sets compression ratio (highest sensitivity is maximum compression)