Caroline Haymaker drive, made in USA. These are a handy boost/drive pedal with a lot of tonal options at your disposal. The switch changes the style from a mid-hump drive to a clean boost to a saturated stack type sound, and there's a lot of range in the tone and gain controls. Handy, well made and sure to get along nicely with your other pedals.

Model: Caroline Haymaker Dynamic Drive
Made: Colombia SC USA
Type: low-mid gain boost/overdrive
Power: standard 9v supply or battery
Switching: true bypass
Draw: 10mA or less
Dimensions, excluding knobs/switches/jacks: 120x92x35mm 
Equivalent new street price (approx): $289aud
Mods: velcro attached
Accessories: original box, no manual
Condition notes: used, few very minor marks, excellent condition

Controls
Volume (top left): output level
Punch (top right): amount of drive added
Shape (bottom right): overall tonal character and 'grit' 
Highs (bottom left): aka stacks, this is a low-pass filter
Toggle switch: left is soft clipping, middle is uncompressed, right is hard clipping

Here's a handy to give you the idea.