Turns your guitar down, which is handy. The minimum setting on the top is handy if you run a dirty amp, like a JCM800 etc, and want to use this like a rolling footswitch for clean/dirty. Old, but cute. Like me.

Model: Boss FV-100 Guitar Volume
Made: Japan, 1988 approx
Serial: N/A
Type: volume/expression
Power input: standard 9v DC centre-negative (supply not included)
Accessories: vinyl pouch

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