Boss AB-2 with modification

I bought the Boss AB-2 and it works great. It is actually a little smaller than I expected but that is just an observation on my part. Easy to use! My application needed the status lights so this is an upgrade from an unlighted model I had. As reviewed elswhere, changing batteries is kind of a pain as you need to remove two screws and that is my reason for only a 4 star rating. If you don't remove the in/out cable, your batteries will be toast after about 5 days. Knowing this, I intended to modify mine when I bought it and did so successfully by using a 3V power adapter, an "M" type jack with switching so that it can be used with AC or batteries. Roland (Boss) should have done that when they produced it but of course, that woud raise the price. This AB switch is very quiet (probably due to the FET switching) and actually had less electrical noise than the mechanical switch I used it to replace. A great buy!