Smart Water Level Alarm Sensor Alert Detector
The alarm has a floating ball, can be used to detect water level, when the water level is higher than the position or below this position, will send out alarm prompt.
Using the principle of floating ball, pure water, air conditioning water, distilled water and other high purity water can also be used, can be any water could be used.
Power supply: use this paragraph section 9 v battery (No include battery)
You can DIY extend cable by yourslef with electrical wire