4-Way Relays Hat Module for Rpi3B+ Programmable Stackable GPIO Expansion Board

Supports for Rpi4B/Rpi3B+/Rpi3B/Rpi2B/RpiA+/RpiB+. Expand GPIO pin. Up to 4 layer can be stackable, and you can use multiple stackable relays module to add many channel. Support for stackable. The installation of the 4-channel module is simple and fast, just insert it directly onto board, then lock with screws and coppered column.

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