2x Flip-Flop Latch Relay Module MOSFET AOD4184 Chip Bistable Self-locking Switch. 5Pcs 6A DC3V 3.3V 5V Electronic Switch Latch Bistable Self-locking Trigger Board. Press the trigger button, the relay is locked, press again, the relay off, you can also add the trigger switch, and the use of low-level trigger.
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