Waveshare PoE UPS Uninterruptible Power Supply Base Board for Raspberry Pi Compute Module 4 with Gigabit Ethernet/Dual HDMI/Quad USB2.0 etc.Interfaces - CM4-POE-UPS-BASE-EN

• Standard CM4 Socket And Color-Coded Raspberry Pi 40PIN GPIO Header, Suitable For Compute Module 4 Lite/EMMC Series Module (Batteries and RPi CM4 are not included)) Able to charge the batteries and provide power output for the system at the same time from external power supply. Automatically switch over to batteries output if external power supply is unavailable, keeps the system running without trouble Multi Power Supply Options, Dynamic Path Management, More Stable Power Supply Protection Circuits For Over Charge/Discharge, Over Current, Short Circuit, And Reverse-Proof. Along With The Standalone Resettable Fuse For Each Battery, More Safe And Stable Monitoring The Batteries Voltage, Current, Power, And Remaining Capacity Via I2C. When the voltage dips too low, it is possible to save files properly and then shutdown the system by software, to avoid any data loss