PoE 5.5mm 2.1mm DC Power Over Ethernet Injector Splitter Adpater Cable M/F Kit Great for applications where you need to install a wireless access point, but a power plug is unavailable or very far away from where the wireless access point needs to be installed. Easily extend the range of the ethernet devices without a separate power cable. Suitable for all types of different devices such as IP telephones, IP cameras, wireless LAN access points etc. Size of power tip: 5.5*2.1 With standard CAT5 network cables.