These are Giga-bit POE Injector which is simply connects your PoE-enabled network device to a non-PoE LAN switch port. It can be used to connect a wireless access point, IP phone, network camera or any IEEE 802.3af/at-powered device (PD) to a network switch. It is also called as POE Adapter. These is used when CCTV Camera is IP+POE but network switch is not POE switch.