Barracuda Intruder Defense System Model DSI for Inward Swinging Doors Discontinued the most popular style of this cabinet makes a the most popular style of stethoscope today The PRESTAN manikin simulates the way an actual victim’s head would move if he she required CPR 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 (Model DSI Fits 5 3 4" Jam) The user places the device on the floor and slides the metal plates under the door