Electro-Harmonix Bassballs Twin Dynamic Filter and Fuzz Pedal

This is such a fun box of nastiness. It's a fuzz, or a distortion that leans in that direction, paired with a dynamic filter. The result is a disgusting raspy, snarly, square-wave-synth type tone that's filthy on bass and also upsetting on guitar. This is the early-90s big box version, which is pretty tricky to find these  days. 

Model: EHX Bassballs Twin Dynamic Filter
Made: Russia
Serial: N/A
Type: fuzz / filter
Power Input: standard 9v DC centre-negative (supply not included)
Accessories: none

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