ITEM NAME:4 Way Channel 5V Relay Module Relay Shield Control Board Expansion Board #gib Store Home Promotion Hot Item Add to Fav.Standard shielding interface and shape. 3pcs M3 screw positioning holes for easy installation. Relay shield interface: Relay: Sky-5V DC relay, model HJR-4102-L-5V, where Relay 1 represents the first relay, and so on.
