BMES Electronics 4- Channel Relay ULN2803 Board Module 6V for Arduino PIC AVR DSP ARM Micro Controller Board Electronic Hobby Kit

The board has four relays which are rated to work on 6V but the input signal can come directly from microcontroller output working at 3V or 5V to control relays. Each relay can switch variety of AC or DC high voltage, high current loads working at 110V or 220V AC mains like lights, fans, and motors and such. The status of relay is indicated by the RED Led.