The 5V relay module is suitable for SCM development, home appliance control. It is with 5V~12V TIL control signal which can control DC / AC signal. The module is perfect for common development application. Color: Blue + black Suitable for SCM development, home appliance control 5V-12V TTL control signal, can control DC/AC signal Can control 220V AC load 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