The GL4530F with Photoresistors Through Hole RoHS is manufactured by Jing Chuang. It is a dark-activated switch module, which can detect the change in surrounding light intensity, then convert the light into electric signals. It can detect sunlight, spotlights, headlights, and other light sources and is ideal for applications in LED lighting, lamps, switches, dimmers, automation and other projects. The module also features a long operating life and robust construction with a resistance to harsh climates. Additionally, it is RoHS compliant and halogen-free, making it environmentally friendly.