It is a double A / B VOX.
At input 1/2 there are two guitars / basses, and one can be selected
from the two instruments to one output 1/2.
Particularly useful to those who use more than one instrument
and amplifier in each set.
The circuit is true by pass
The power supply is via a 9V Boss type DC adapter.
Because the circuit is Passive the pedal can be used without power supply
(But without lighting the Led)
Dimensions: 11cm x 6cm x 3.2cm
Price: 50 Euro