Barracuda Intruder Defense System Model DSI for Inward Swinging Doors CLIA Waived Non chill bell and diaphragm Standard Trauma Kit:Complete Kit w Bag Non chill bell and diaphragm foldable box that will block ambient light and provide a vivid display of simulated germs Pushing outward on the handles engages the plates to the exterior door jamb and the device is securely locked in place by simply inserting a pin The Barracuda Intruder Defense System is helping keep classrooms and public buildings safe in the event of an active shooter situation it is a security device that can be installed in a matter of seconds in emergency situations to protect occupants against intruders