What is it: This kit allows user to realize a KVM project with for 4 Model B which can control a computer using a web browser. Compatiblity: for use with for 4 Model B 8GB/4GB/2GB/1GB only, NOT support for 3 or Pi 5. Function: Remotely turn on / turn off / restart your computer; configure configure the UEFI / BIOS; Reinstall the OS using the Virtual CD-ROM or Flash Drive; Remote use your keyboard and mouse; a keyboard, mouse, and a monitor and presented in a web browser, etc. How to Power: POE Power (Recommend, need a POE switch) or Power Input: 5.1Vdc +/-5% , equal 3A power via USB-C port of X630-A8. How to Cool: X630-A8 comes with an onboard active cooling fan to cool down the 4. Extra Needed to Prepare by youself: for 4 Model B, TF card, power adapter (only requires it if you have no POE switch). User Manual:..com/PiKVM-A8 Colour:Black Material:PCB+electronic components Package Contents: 1 x PiKVM-A8 kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.