Main Features: > Battery Operated Long-life lithium-ion battery sealed in the alarm to lengthen its lifetime to 10 years in standby condition. > Operating Light (LED) Flashes approximately every 53 seconds confirming unit is powered. > Low Battery Warning Alarm beeps every 40 seconds when more...
main features: 1 . power supply non-polar input 2 . infrared photoelectric sensor 3 . mcu processing, eliminate false alarm 4 . network led indicating alarm 5 . smt manufacturer technology, high stability 6.dustproof, mothproof, anti-light interference design 7.stainless steel shield in chamber, anti-rfi(20v/ more...