There is also a movement sensor with adjustable sensitivity that will activate the alarm if it’s tampered with. On/off switch is on the back of the alarm and the sensitivity switch is on the side.  Uses one 9-volt battery (not included).

We have a sleep walker in our family and this is a perfect choice for keeping her inside while on trips. When in a hotel or motel, the tripple action door stop alarm would activate if she either moved or tried to open the door at night.

It also blocks the door from opening, which keeps out unwanted entries to the room by hotel staff or people from the occasional double booked room.

The unit size makes it easy to pack and carry along.