Passage detector alarm with a communication range up to 100 meters between infrared receivers and the receiver. The detection range of the infrared receiver is 3 to 7 meters. Provides advance notification when visitors or intruders arrive. Motion sensor alarm features 38 selectable ringtones with 3 volume levels: high, medium, or low. Receiver operating modes: LED light flashing only, or both sound and LED flashing. Power supply for receiver: AC 110240V. Power supply for transmitter: 3 x 1.5V AAA batteries (not included) or 5V DC adapter (not included). Applications include entryway alerts, anti-intrusion alarms, passageway monitoring, security alarms for indoor areas, warehouse monitoring, utility closet alarms, garage and tool shed monitoring, mailbox sensing, and front door or walkway detection.