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Microcontroller development board can be used as modules, can be used as appliance control; 5V - 12V control signal of the TTL; Using SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA; The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient; Maximum load: AC 250V/10A; AC125V 15A; DC 30V/10A; Fault-tolerant design, if the control line is broken, the relay will not operate; Useful to control a motor, a led strip, or any other module. How to use it: Just connect a digital output of your board to your relay module, and you can control a power-demanding appliance with the digital signal.