This 4 port 10/100Mbps PoE switch is with 48V/1.25A external power,it provides an easier installation way for PoE devices ,such as IP cameras,wireless AP,VoIP. And it can detect your PoE devices according to PoE standard.So the users do not need to worry about the PoE switch will damage their PoE devices. The max transmission distance is 100 meters with Cat5 cables. Ideally,shorter cable would reduce the power degradation over the cables; with high quality cables also can reduce power loss.Plug & play design make the installation quite easy,users do not need any configuration,which make this PoE switch a very good choice for IP cameras,wireless AP,VoIP users.Features:IEEE 802.3af Power over Ethernet PoE compliant.Supports 10/100Mbps fast Ethernet.48V/1.25A External power supply.Max power for single PoE port is 15.4W.Automatically detects the PoE class level of a Powered Device.1Gbps bandwidth.Store-and-forward switching method.Plug and Play.Specifications:     Standard & Protocol IEEE 802.3 10Base-T IEEE 802.3u 100Base-TX IEEE 802.3ab 1000Base-T IEEE 802.3af Power over Ethernet (PoE) IEEE 802.3x Flow Control Interface 4x100M ports PoE (Auto-negotiation,Auto MDIX) Port 5 is a 10/100Mbps uplink port Data Transfer Rate Ethernet: 10/100 Mbps (Half / Full Duplex) Forwarding Rate 100 Mbps / 148,800 pps, 10 Mbps / 14,880 pps Power supply Input:100-240 V/50/60 Hz 48V/1.25A external power DC48V Power pin:12(+) 36(-) Indicators Power, PoE, Link / Activity   Environment Operating Temperature:0℃-40℃ Storage Temperature:-40℃-70℃ Operating Humidity:10%-90%,no condensing Storage Humidity:5%-90%,no condensing Transfer Method Store-and Forward Dimensions Package weight: 700g / 1.54lb Package size: 22 * 21 * 5cm / 8.66 * 8.26 * 1.96in ( L * W * H) Package list:1 * PoE switch1 * Adapter2 * Accessories