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. 2-way magnetic control detection, self-contained relay, can also be used for two kinds of sensor induction, triggering of two conditions, connecting the output terminal (AND gate), either condition, triggering, connecting the output terminal in parallel (or gate), two The group independently controls three control modes and directly connects AC high-power products. Module features: 1, using imported normally open reed switch, with its own relay, direct control of the load 2, working voltage 12V 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 reed switch needs to be used together with the magnet. When a certain magnetic force is sensed, the relay is closed, and the common end is connected to the normally open end. When no magnetic force is sensed, the relay is disconnected, the common end and the normally closed end. Connected 2 The sensing distance between the reed switch and the magnet is less than 1.5cm and it is not sensitive or there is 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.