use: Door opening, window opening, door detection, door alarm trigger, program control switch, copier, washing machine, refrigerator, camera, disinfection cupboard, door magnet, window magnet, electromagnetic relay, electronic scale, level gauge, gas meter, water meter The middle and so on have been well applied. Magnetic control detection, self-contained relay, direct connection to AC high-power products. Module features: 1, using Hall sensor, with its own relay, directly control the load 2, working voltage 6-24V 3. Output form: load directly connected to AC 220V 10A or DC30V 10A 4, with 4 fixing bolt holes for easy installation 5, small board PCB size: 6cm x 4.3cm 6, using a wide voltage LM393 comparator Module instructions: 1. The Hall sensor needs to be used together with the magnet. When a certain magnetic force is sensed, the relay is pulled in, the common end is connected to the normally open end, and when no magnetic force is sensed, the relay is disconnected, the common end and the normally closed end. Connected 2 Hall sensor and magnet sensing distance within 5mm is not sensitive or there will be no triggering phenomenon; 3, the common end, normally open, normally closed three ports are equivalent to a dual control switch, when the relay coil is energized, the common end and the normally open end are conducting, when there is no electricity, the common end and the normally closed end are conducting; In the on state, the relay is closed, and when there is no magnetic force, it is in the off state.