4 Channel PoE Extender: This 4 port PoE extender includes 3 PoE out and 1 PoE in. It can provides PoE power to up to three PoE devices, 10/100/1000Mbps speed. Each PoE extender has an transmission distance of 100 meters (328ft). Compatible with IEEE802.3af/at: This 4 port gigabit PoE extender works with standard IEEE802.3af/at POE switches.Input Port 1 IEEE802.3af/at Max 30W, Output Port 2-4 Max 24W, Average 8W per port. PoE Voltage 44-57 Vdc. PoE pin: Input, 1/2 (+), 3/6 (-), 4/5(+), 7/8(-); Output: 1/2 (+), 3/6 (-).