Key Highlights - Detects light intensity - Adjustable sensitivity - Digital output: 0V to 5V - LED indicators for power and output - Stable with LM393 chip - Easy to install Product Description LDR Sensor Module The LDR sensor module detects light and measures how bright it is. When there's light, the output is high, and when there's no light, it's low. You can change how sensitive it is using a small dial (potentiometer).