If your child removes an appliance plug from this Safe Plate, it automatically closes to seal the outlet. To use: insert the appliance's plug into the plug face, then while pressing gently, slide the plug and cover to one side until the plug is firmly secured in the outlet. This child safety outlet cover is nice looking and replaces your existing outlet plate. It even accommodates those large, three-prong grounded plugs. Perfect for outlets used often. Doesn't require wiring. Thermal Seal Insulation eliminates outside air infiltration and saves energy (not included with 4 pack). CSA approved. Specify outlet style: Standard with 1 screw. 10 Pack.