Overview:  The water instruction sensor can work with SONOFF RF Bridge 433, alarm system, etc.  When detecting water overflow, alarm notification message will be immediately sent to the APP.    Features:  - Can be equipped with wireless host. Installation by double-side adhesive, easier and convenient to install.  - 433MHz frequency, wireless transmission is more than or equal to 200 meters in open place.  - When the two feet of the detector was immersed by the water, it will give flash and send alarm message to the alarm host.  - Excellent design, tiny and fashion. Low-consumption design, which can make it work long time.  - Ideal water intrusion warning for homes, apartments(kitchen, toilet), warehouses, offices, laboratory, hotel rooms, garages, etc.    Specifications:  Type: Water Level Alarm;  Frequency: 433MHz;  Emission protocol: 1527;  Working Voltage: DC 12V;  Battery Type: 12V 23A(not included);  Standby Current: le5uA;  Alarm Current: le10mA;  Transmission Distance: ge200m(in the open area);  Working environment temperature: -10℃~60℃;  Operation humidity: <80%;  Item Size: Approx. 7.8 * 3.7 * 2cm (L*W*H);  Item Weight: Approx. 38g / 1.3oz;    Package Information:  Package Size: Approx. 9.3 * 5.6 * 3cm/ 3.7 * 2.2 * 1.2in;  Package Weight: Approx. 46g / 1.6oz;    Package included:  1 x Water Instruction Sensor;  1 x Mounting Sticker