The TP-Link POE INJECTOR(TL-POE150S) is a PoE (Power over Ethernet) Injector, which delivers power over the Ethernet connection. It is fully compliant with the IEEE802.3af standards and can work with all IEEE 802.3af PoE compliant powered devices or PoE receiver adapters. Further it lets you expand your network to places where there are no power lines or outlets, allowing you to fix devices such as Access Points, Cameras, IP Phones etc. The device can deliver power up to 100 metres. It automatically determines the power requirements for the device too. The system supports Gigabit Speed for use in high-bandwidth applications too. The device requires an external power supply.