Handy little boost. It's pretty transparent and there's plenty of juice on tap, so if you're after a one-knob-wonder to add some steroids to your workout, here's the goods. 

Model: TC Electronic Spark Mini Booster
Made: Thailand, recent model
Serial: sticker missing
Type: overdrive
Power Input: standard 9v DC centre-negative supply or 9v battery (not included)
Accessories: none

Condition notes: used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)