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Ideal for electronics engineers, developers, and enthusiasts working on automation projects requiring electrical switching for Raspberry systems The screw terminal interfaces simplify wiring connection while the universally voltages compatibility and errorproof design make this relays module adaptable for various power supply environment and control scenario Equipped with selectable triggering mode, visible statuses LEDs ( greens power / red relays), and fails safe design accidental activation during wire disconnection, it ensures reliability circuit control with 5mA triggering current This 1 channel relays module features high / low levels triggering compatibility, supports 3.3V / 5V / 12V / 24V operate voltages, and delivers stable with AC10A / 250V & DC30V / 10A load capacity through optocoupler isolation Perfect for smart home installations, industrial equipment control, and robotics applications where secure isolation between control circuits and highly power devices is critical