Feature: 1. The 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. 2. The detection method is water detection. One‑click opening mode. You can turn it on immediately when you need it, and turn it off when you don't need it. 3. The 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. 4. It 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). 5. The 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 wall‑mounted. Specification: Item Type: Water Leak Detector Material: ABS Transmission Frequency: 433 MHz Water Immersed Battery: 3V 1 x CR2450 battery (battery included) Detection Mode: Water sensing detection Installation: Wall hanging Ambient Humidity: ≤95%RH Working Humidity: -10 - 60℃ Detection Line: Approx.1m/39.4in Wireless Transmission Distance: Approx. 100 - 200m/109.4 - 218.7yd(in the open space). Package List: 1 x Water Leak Detector