Without the ability to install a home security system, renters and travelers can have a hard time feeling secure in their temporary housing. Sabre's Door Stop Alarm is a great solution to either help fortify an existing home alarm system or use on its own in a bedroom, dorm, hotel room or apartment. The extremely 120dB loud alarm is audible up to 1,500-feet (455-meters) away and sounds when door pressure is applied. It is compatible with doors that have a 0.75" gap between the floor and bottom of door (if the gap is greater, the alarm will not be able to activate when the door is opened). The alarm is coupled with a non-skid pad to prevent the door from opening. This attractive, premium white alarm installs easily in just seconds – simply slide it under the crack of an inward-swinging door. There’s no wiring needed, so the alarm works during power outages. Requires 1 x 9V battery (not included). A small Philips Head #1 size screwdriver is required to remove battery compartment cover. For an extra level of security, the Door Stop Alarm provides a battery status update via a low battery indicator.