This is a great product, especially for interior doors that are hard to keep locked.
Remember, it only takes a single incident for yoru life to be turned upside down.
This is an interesting defensive product that sounds a piercing 125 db alarm hould an intruder attempt to enter that braced door. Moreover, with its wedge-like design, the unit will wedge underneath the door and its non-skid pad on the bottom will hold the door tighter the harder it is pushed.
Not a bad product and very reasonable at undr $15 per unit.