Quantity: 1 - Color: Blue - Material: PCB board - Working voltage: 3.3V~12V - Current: Over 15mA - Output: Digit switch output (0 1) - Uses wide voltage LM393 comparator - Indicator light for indicating switch and power. - Using photoconductive resistance sensor - Sensitive to light it's often used to test light brightness around - Universal use with photo resistor sensor module - When environment light brightness can't reach the set range the output is high; when it over the set range the output is low - Directly connected to microcontroller testing environment light brightness - Drive relay module directly via output port which can be composed of a light control switch