Patent ID: 7847689

Claim:
An intruder alarm device comprising: an outer casing, means for mounting the outer casing to a vertical surface, detection means for detecting if an individual enters a room in which the intruder alarm device is located and activated, notification means for notifying a homeowner that an individual has walked into a room in which the intruder alarm device is located, wherein the vertical surface further comprises a door frame, said door frame being located immediately adjacent to a door, wherein the outer casing has a rectangular or cubical shape, wherein the means for mounting the outer casing to a vertical surface further comprises: a quartet of external mounts, wherein each external mount is attached to the outer casing, a plurality of fastening devices, wherein a fastening device is used to attach each external mount to the vertical surface, wherein the detection means for detecting if an individual enters a room in which the intruder alarm device is located further comprises: a slot located on the outer casing, a trigger axially attached within the outer casing, the trigger extending outward through the slot, said trigger having an extendible range from a vertical position to a horizontal position, wherein the trigger is in a disarmed state when the trigger is in a vertical position, further wherein the trigger is in an armed state when the trigger is in a horizontal position, a central processing unit located within the outer casing, power means for providing power to the central processing unit, an internal alarm located within the outer casing, the internal alarm being connected to the central processing unit, and means for activating the internal alarm responsive to when the trigger in the horizontal position is being pushed by a door against a side of the slot on the outer casing.