Found in two of the three bedrooms at our Airbnb; both ends plug into an outlet but nothing else. The silver tag says "extension cord" and the circular end of the plug
W4W Twin Extension Cord Power Strip - 24 Foot Cord - 12 feet on Each Side - Flat Head (Wall Hugger) Outlet Plug - 6 Polarized Outlets with Safety Cover - Walmart.com
How to Safely Run Electrical Cords in Your Home (and What You Should Never Do) | Lifehacker
Mercury 4 Gang SLIMLINE Wall Mountable UK Mains Extension Power Str...
in wall extension cord - Best Buy
Can I run an electric power cord or extension cord through the wall?