4 channel 5v relay shield module, Four channel relay control board relay expansion board for arduino UNO R3 mega 2560
Module features are as follows:
1. Standard For Shield interfaces and shape
2. Can continue to stack other For expansion boards
3. 3 M3 screw positioning holes for easy installation
4. High Drive (5V or 3.3V) normally open contact closure
5. Onboard relay indicator
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