Description1. Surge and Undervoltage Protection: Automatic surge and undervoltage recovery protection devices meet modular design standards.^2.Reliable Performance: The product board uses high quality electronic components for reliable performance.^3.Automatic Protection Function - When the power supply is unstable, its protection function will be activated automatically, once the voltage exceeds a limited range of products, it will be automatically cut off to protect the safety of electrical equipment and personnel.^4.Open in One Minute: When the power returns to normal, the device will turn it back on within one minute.^5.Green and Red Light Display: Green light indicates power supply is working properly, Red light indicates over voltage or under voltage.