This is the security door wedge designed by a former  military special operations aviator that stops intruders with a force 10X stronger than a standard deadbolt. Made with steel, Delrin (a high performance acetal resin), and military-grade nylon, the locking wedge anchors to your floor and uses the strength of your home’s frame to foil prowlers or thieves. The device locks and unlocks using a built-in floor pedal or your smartphone via a free app. It can be installed onto any flat, hard surface including vinyl, hardwood, tile, and concrete. Requires 3/4" gap beneath a door for clearance. Black. 30" W x 4" D x 3/4" H. (7 lbs.)