3units! 2 Channel DC 5V Relay Switch Board Module, for Arduino Rberry Pi PIC ARM UNO Useful alarm function and hourly

Useful alarm function and hourly chime function

11 a/b/g/n/ac Wi-Fi + Bluetooth

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3units! 2 Channel DC 5V Relay Switch Board Module, for Arduino Rberry Pi PIC ARM UNO Useful alarm function and hourly3 units! 5V Relay Module with Optocoupler Low Level Trigger Expansion Board for Arduino 2 channels These relays work great, genuine work horses, with SMD optocoupler isolation, and very stable performance. It can be used as a microcontroller development board module, or as home appliance control. Normally open interface and can be set to high or low triggered by jumper. Maximum load: AC 250V 10A, DC 30V 10A. Trigger current: 5mA Fail safe design, even