"Used these loads of times for power or data/AV applications.
Very simple to install, only things to watch for are don't get to close to a stud or the locating lug won't be able to be pushed in and they can sometimes be a bit funny to get located properly if the board thickness is too much, i.e. if its had a very thick skim plaster.
"What a great product for plasterboard walls, simply draw around the base, cut it out using a drywall saw and slot in. The wings anchor the unit to the wall when the faceplate is screwed in. I wouldn't use anything else for drywall!"
"Moved a socket in a stud wall so needed a new drywall back box. Drew round the outline on the wall and cut out the rectangle of plasterboard. New box slid straight in snugly and locking wings snapped not place. Made my life easy !"