The PIR43 Mini Alarm Sensor is a pocket sized, dual-pyroelectric infrared sensor alarm that provides reliable detection all day long. The PIR43 uses a high sensitivity detector, an integrated circuit and SMT technology to detect movement of people and vehicles, while allowing small animals to pass through undetected. The unit is easy-to-install, automatic, convenient, and has a safety and practical function. The wide detection range consists of horizontal and vertical detection fields. It utilises human motion infrared rays as control signals and sounds the alarm when motion is detected. This unit’s?convenient size makes it perfect for concealing and travelling.