This is an AB switch with the A or B inputs going to the output. There is a volume pot for the A input, which comes in handy when you have two guitars that you use on the same amp, but one has a hotter signal than the other.
This pedal lets you lower the level on the louder guitar so both signals will be the same level going to the amp.
The pedal is totally passive. If you need to power the status LEDs the pedal has a Boss style 2.1mm 9v DC socket.
The pedal is built with:
Aluminium enclosure
Neutrik plug sockets
3PDT heavy duty footswitch
Point to point wiring
Status LEDs
2.1mm centre negative 9v DC socket