Light Sensor Board with Relay
Adjustable sensitivity & instruction video

This listing is for a neat little light sensor based relay driver board.  There are three relay output pins that are talked about in the above video demonstration.  This module requires 5v  @ 60mA or more to operate.  The relay is turned on when the light sensor detects light, and off when the light sensor detects darkness.  Sensitivity is adjusted by turning the on board variable resistor knob.  There are four mounting holes on the module so that you can easily mount it to your project box.  If you have any questions, please do not hesitate to ask.

Interface Pins:
VCC - Supply line.  Connect 5v here.
GND - DC ground line
Relay Interface Pins (Not labelled in English.  Please see where they are in the video, as they are talked about):
COMMON PIN -  When the relay is not activated, this pin is connected to the NC (Normally Closed) Pin.  When activated, it connects to the Normally Open (NO) Pin.
NORMALLY CLOSED PIN - When the relay is off, this pin is connected to the CO (Common Pin) 
NORMALLY OPEN PIN - When the relay is turned on, this pin is connected to the CO (Common Pin)