4 Channel PoE ExtenderThis 4 port PoE extender include 3 PoE out and 1 PoE in. It can provides PoE power to up to three PoE devices, 10/100Mbps speed. Each PoE extender has an transmission distance of 330ft(100m). IEEE802.3af and IEEE802.3atThis 3 channel PoE extender works with all standard IEEE802.3af/at POE switches, POE injectors and POE NVRs. PoE voltage is 44-57V. The Max input is 30W, and the Max output is 24W. Each port can power standard PoE devices less than 8W like IP phones, IP security, IP speakers, etc.