ITEM NAME:2pcs Light Intensity Photosensitive Sensor Resistor Module for Arduino A#S Product Description Description: Features: For Light intensity detected,light brightness sensors,smart car module. Using the sensitive type photosensitive resistance sensor. Waveform of the comparator output signal is good,strong driving ability. With adjustable potentiometer can adjust and detect the brightness of the light. Come with bolt holes for easy installation. Specifications: Working voltage:3.3-5V Output format: digital switch output (0 and 1) Mini PCB size: approx. 3.2cm*1.4cm/1.25*0.55'' Quantity: 2pcs Net weight: approx. 4g Operation Manual: VCCÂ Â Â Connect to power supply positive 3.3-5V GNDÂ Â Connect to power supply negative DOÂ Â Â Â Â TTL switch signal output Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Included: 2 x Light Intensity Photosensitive Sensor.Using the sensitive type photosensitive resistance sensor. Included: 2 x Light Intensity Photosensitive Sensor. For Light intensity detected,light brightness sensors,smart car module. Quantity: 2pcs.