1.Built-in plastic piston moves left and right, permanent magnet with reed switch gives switching signal (0/1)；Plastic quick connection interface, simple and practical structure；Take the product arrow as the water entry direction, and the switch is installed horizontally upwards 2.In order to avoid particles and debris entering the water flow switch, a filter screen must be installed at the water flow switch inlet; 3. In the process of installation and use, be sure to cooperate with the relay (power below 3W) to avoid burning the reed switch due to the small switch power. 4. The characteristics of the water flow switch may change when a magnetic material or device that generates magnetic force on the water flow switch is close to it. 5.The installation and use environment of this water flow switch should avoid places with strong vibration and shaking to avoid misoperation of the water flow switch.6. DO NOT to load the water flow switch directly on the water pump or other electrical appliance