1) Unique Design - Tool Free. Open and maintance the traffic light without any special tool 2) High Light - Use the best quality LED components 3) Long Life - Up to 50,000 Hours, adopted the PWM constant current power, protect the LEDs efficiently 4) Energy Saving - Can save up to 80-90% energy 5) Luminance Adjustment ?Can adjust the luminance according the environment brightness automatically 6) Housing Optional ?PC (polycarbonate) or AL (Aluminum) housing optional 7) IP65 Grade?Sealed moisture resistant enclosure 8) Related Approvals - CE, Chinese GB14887-2003 standards and related international standards.