1PORTABLE DETECTOR: Infrared scanning detector, portable design, which can be used for individual security alarm, door open alarm or emergency help alarm. 2SOUND LIGHT ALARM: Press the SOS button to alarm, the machine will send out 130db sound and light alarm, and with IR LED, has a long sensing distance. 3HIGH SENSITIVITY: The shake and motion detection sensor of the machine will trigger and issue 130db sound and light alarm, suitable for indoor and outdoor. 4CAMERA DETECTION: Scanning to detect camera lens optical reflections in hotel rooms, this feature can assist in the detection of wired and wireless camera lenses. 5WITH BATTERY: The detector has built in 7V 150mah battery, can be fully charged for more than 3 months, and the alarm standby time is 1520 hours.