Slim, Shallow Design - Reduced depth makes it easier to install in any electrical box, even shallow ones * Provides up to 25 percent or more space in the wallbox vs. other GFCIs * Tamper-Resistant - Shutter mechanism inside the receptacle blocks access to the contacts unless a two-prong plug is inserted, helping ensure hairpins, keys, etc., will be locked out * Automatically tests the GFCI every time the RESET button is pushed in. The GFCI will not reset if its circuit is not functioning properly * Withstands high torque and resists wire pullout