Part Number: CM4-POE-UPS-BASE PoE UPS Uninterruptible Power Supply Base Board designed for Raspberry Pi Compute Module 4, Gigabit Ethernet, Dual HDMI, Quad USB 2.0 standard CM4 socket and color-coded Raspberry Pi 40PIN GPIO header suitable for Compute Module 4 Lite/eMMC series module It is able to 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 any trouble 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