1The alarm function needs to be used with the host(not include host) and the flood alarm. When the immersion probe detects that the water level exceeds the standard, the alarm sounded immediately. 2The detection method is water detection. Oneclick opening mode. You can turn it on immediately when you need it, and turn it off when you don't need it. 3The sensitivity of the detector is sensitive, and the false alarm is 0. When the detector detects the overflow, it reacts as fast as 0.1 seconds and emits an audible alarm. 4It saves energy and electricity. Low energy consumption, standby for up to 1 year, no need to replace low batteries frequently. If the alarm time becomes shorter, please replace the battery in time(include battery). 5The detection line is Approx. 1m/39.4in, and the wireless transmission distance in the open area is Approx. 100 200m/109.4 218.7yd. The installation method is wallmounted.