This is a baby safety wall plug outlet shroud.
It replaces a standard sized 2 outlet wall plug cover. (sizing based on a USA wall plug)
The idea is your little gals and guys might be able to yank the cord out of the wall, but they won't have an easy line of access to live prongs as the plug is partially wiggled out.
Also a cool addition even if you don't have kids. People tend to like the look of these independent of the baby proofing aspects.
WARNING >> take care during installation to not electrocute yourself. A slip of the screwdriver can send the metal screwdriver or screw directly into the outlet. Advisable to shut off the circuit breaker during installation. Or use an "isolation" screwdriver taking care to use one hand only, and not be touching the metal blade of the screwdriver at any time.
WARNING >> no guarantee that your child won't grab and bust the hole plastic shroud off of the wall, or find some way to still electrocute themselves. Use at your own discretion.
Do Not Scale
Use supports on the very "bottom" surface (the surface directly contacting the wall).
The big domed cavity can be bridged without supports if you have your setup dialed and know what you're doing.
measured a standard wall outlet cover.
built ground up model with holes to accept standard cord heads.