Feature: 1. Automatic Switching: This automatic emergency power switch module can be automatically switched to connect to the main power supply as a power source when there is power on the main power terminals, otherwise, it will automatically switch to the backup power source. When power is restored, it can automatically switch back to the main power supply. 2. Stable Performance: This power supply automatic switching controller module adopts advanced manufacturing technology with high reliability and stable performance. The screw terminal design is easy to wire and can be used for a long time. 3. Wide Application: This emergency power supply charging controller board has a wide range of applications, the output voltage is usually the same as the input voltage, when the utility power supply, it will continue to charge the battery, which is widely used in incubator cabinets, computers, networks and other situations. 4. Secure And Reliable: This automatic power switching module is secure and reliable, when the battery voltage reaches the set value, the module will automatically disconnect the load, preventing the battery from over discharging and prolonging the battery's life. Lithium battery charging board with overcharge, overdischarge and overcurrent guard. 5. Convenient And Practical: This dual power supply switch module is used for emergency battery switching, when the power adapter is energized, it connects the adapter as a power source (green light is on), otherwise it automatically switches to battery power (red light is on), which is convenient and practical. Specification: Item Type: Automatic Power Switching Module Material: PCB Voltage Input: Main Power Supply 85V-240V Load Current: Maximum 10A . Package List: 1 x Automatic Power Switching Module