This is a handy thing. The addition of a 'minimum' knob on the side that's easy to adjust and a handy tuner out means it's got one up on some other options on the market.

Model: Boss FV-50H
Made: Taiwan, recent model
Type: volume
Power: passive, no supply needed
Draw: n/a
Switching: n/a
Equivalent new street price (approx): $89 approx
Mods: velcro added
Accessories: no box or manual
Condition notes: used, few minor marks, good condition

Controls
Minimum volume: sets the low threshold for when the pedal is fully down