Features:1. Protection: Main feature is when the circuit has problems of overvoltage or under voltage, the product can cut off the power supply instantly to protect the electrical equipment from being damaged.2. Automatically turn on: In addition, the product can automatically turn on the power supply when the voltage of the circuit returns to normal.3. Overvoltage protection+undervoltage protection: This product has overvoltage protection and undervoltage protection. When the product has overvoltage or undervoltage problems, the product has a protection function.4. Failure recovery delay: This product has a failure recovery delay. When a failure occurs, the product still has a delay time.5. Easy installation: This product is very easy to install, no additional tools are needed, and the installation process is very convenient.