DC 12V NE555 Timer Delay Relay Switch Adjustable Module Time Delay Relay Module

The main chip: NE555. A relay and indicator lights. Stream with relay protection. DC 12V 4 Channel RS232 Relay Board PC USB UART DB9 Interface Relay Module. with input power light. DC 5V 12V 4 Channel Delay Relay Module DIP Relay Switch Flip-Flop Self-locking.

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