This is an essential gig bag item. Most modern amps, PA's, accessories and effects that use 120v power use an IEC power cable. This handy adapter can save a gig or rehearsal if you misplace, forget or lose your power cable. This will save the day. It adapts a standard extension cord to an IEC connection. Compact and easy to have handy just in case at a price that translates into cheap insurance. You do need one of these. Don't wait until you find out that you need one before you get one.