Dual 802.3af/at PoE+ injectors are unique PoE injectors with two PoE+ outputs so you can power two PoE or PoE+ devices with one injector. This is very convenient for applications such as powering a wireless AP and a Backhaul or a Camera and a Wireless Link.The DCDC models run on 12VDC or 24VDC voltage such as battery power used in Remote Power Systems. Since the outputs are active 802.3af/at PoE they will not power up the port unless a valid device is plugged into the port.