The ESYSENSE Day Night Sensor uses advanced Photocell and LDR (Light Dependent Resistor) technology to automatically detect ambient light levels, adjusting your outdoor lighting accordingly. During the day, the sensor keeps lights off, while at night, it activates them to ensure optimal brightness when you need it most. Perfect for floodlights, streetlights, and garden lights, this sensor offers seamless, energy-efficient performance that enhances security and convenience around the clock.