This is a good pedal for switching between two guitars into one amp, and I like the fact that it doesn't require power unless you want to use the LED feature.  While most people - myself included - will opt for using the LED to make it easier to track which instrument is active, a 9V battery will do the trick, and unlike most pedals you don't have to worry about it running down when you leave your instruments plugged.  Naturally, that's because the battery functions only to supply power to the LED, and I've had it on constantly for weeks with no problem.