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The Arduino Shield 4 relays is a solution for controlling high power loads that can not be controlled by digital IOs Arduino due to current limits and controller voltage.
DFRobot Relay Shield V2.1 is a completely new design which is capable of controlling 4 relays at a time.
IS Shield is a relay shield for Arduino, with 2 channels mechanical relays and 2 channels MOS switch, providing an easy way for applications of voltage controlling from low to high.