1、Support: For Raspberry Pi CM4 POE UPS expansion board uninterruptible power supply (UPS), supports simultaneous charging and discharging, and supports dynamic route management. 2、CM4 Connector: The onboard standard CM4 connector supports access to Compute Module4 Lite EMMC series motherboards. 3、Power Supply: Dynamic route management of power supply in multiple ways, more stable power supply. Connecting to the external power supply will supply power to the system and charging the lithium battery at the same time; disconnecting the external power supply will automatically switch to the lithium battery power supply, which will not affect the normal operation of the system. 4、Protection Circuit: On board circuit protection circuit, anti overcharge, anti over discharge, anti overcurrent, anti short circuit and anti reverse connection, and each battery is protected by an independent self recovery fuse, which is stable and safer. 5、Multifunction: It can communicate through the I2C interface to measure parameters such as battery voltage, current, power and remaining power. When the voltage is detected to be too low, you can use the program to control the for Raspberry Pi, save the data and then shut down to avoid the sudden power failure of the CM data lost. 1 x Expansion Board5 x Screw4 x Bolt Item Type: Expansion BoardMaterial: PCBCM4 Deck: Suitable For All Versions Of Compute Module4Battery Specifications: 18650 Lithium Battery x 3 (Battery Not Included), CR2032x1 (Battery Not Included)Networking: Gigabit Ethernet RJ45 Interface, Integrated 8023af Network Standard PoE Circuit (5V 2.5A)USB: USB 2.0 Type A Interface x 4Connector: for Raspberry Pi 40 PIN GPIO Interface; M.2 MKEY Interface, Support Access To NVME Solid State Drive, Communication Module With PCIE M.2 MKEY InterfaceDisplay: MIPI DSI Interface x 1 (22pin 0.5mm FPC Connector)Camera: MIPI CSI2 Interface x 2 (22pin 0.5mm FPC Connector)Video: High Definition Multimedia Interface x 2, Support 4k 30fps OutputRTC Real Time Clock: With Battery Interface And Ability To Wake Up Compute Module4Storage: Onboard Micro Memory Card Slot (for Versions Without EMMC)Indicator Light: M.2 Status Led Light; CM4 Status LED LightPower Input: 7-36V