Advantages: - 120 dB voice alarm, work alone, no need alarm host - Water leakage and overflow optional (easy adjust yourself ) - Stable quality and easy use Application: Fish tank, pool, kitchen, solar water heater... Specifications: 1. Triggered by floating ball, according to the water level 2. Power supply: 9V battery (not include) 3. Material: high quality ABS 4. Alarm voice: 120dB 5. Operating temperature: indoor -10 ~ 50degree Celsius, related humidity 95% 6. Cable length: 2.0m 7. Size: Transmitter: 98 mm(L)46 mm(W)22 mm(H) 8. Working temperature-10--+80 degree Celsius Package: 1 piece alarm sensor with floating ball 1 piece 3M Tape