It's an overdrive and a germanium fuzz, stackable or usable independently... fun times to be had! The voltage starve option on the fuzz side allows for some pretty wacky glitchy tones too. Very cool indeed.

Model: Electro-Harmonix Germanium 4 Big Muff
Made: NYC USA, 2017 (serial 201710246006)
Type: fuzz/overdrive
Power: standard 9v power supply (not included)
Equivalent new street price (approx): $255aud
Mods: velcro attached
Accessories: original box and manual
Condition notes: used, few minor marks, very good condition