The Trend Networks R158004W2 2 Year Warranty Extension for the PoE Pro Data Cable and Power Over Ethernet Verifier - PoE Pro eliminates guesswork when installing, maintaining, and troubleshooting networks where PoE is deployed. The R158004W2 PoE Pro's previously technicians had to understand all the various standards, device power outputs and cable lengths to be sure a device will operate successfully. The PoE Pro identifies the Class of the PoE source and power available to a PoE device regardless of cable length, cable quality or other factors.