For sale is a Boss PSM-5 Power Supply & Master Switch, made in Japan August of 1985. It functions as power supply for up to 7 Boss effects pedals and a master controller/effects loop for your entire pedal board. Your entire board can be bypassed with one press of the foot.
The pedal is really good shape and ready for use. It has some dings and marks, but it is in really good shape for its age. (please look at the photos.) The pedal does require a Boss PSA adapter or equivalent (not included).