... detecting ability.C. Easy to install, absolutely wireless, power supply built-in, wireless telegraph transmitting signal.D. Save power design ... & high capacity, it lasts longer than other wireless infrared detector.E. Extending socket built-in, compatible with ... current: static < 30uA; alarm < 20 MaSelf-check: 1~2 minutesWireless parameter: frequency 315MHz, Transmitting distance >150 m (wide area ...