TL-SG1005P-PD is an unmanaged switch with 5 Gigabit ports that requires no AC or DC power supply. It provides 1 PoE (Power over Ethernet) IN port and 4 PoE OUT ports. It can automatically detect and get power from all IEEE 802.3af/at/bt compliant Power Sourcing Equipment (PSE) at port 5 and provide power for IEEE 802.3af/at compliant Powered Devices (PDs) at port 1-4. In this situation, the electrical power is transmitted along with data in one single cable allowing you to expand your network to where there are no power lines or outlets, where you wish to fix devices such as APs, IP Cameras or IP Phones, etc.