About this item USE PROPERLY: This product is only used for network equipment with PoE signal function, as relay equipment to achieve signal extension. the total output power is 25.5w and the maximum output of each channel of 4 ports is 15.4W, each single port cannot be provided 15.4W at the same time. When using, the total output power of 4 ports should be less than 25.5w. Applicable Range: A Used with AP, IP camera, IP telephone and the other network equipments in the situation of the lack of power line or far away from the power outlets. A Instal at hotels, schools, buildings,etc.When using and installing, please strictly follow the product power and related electrical parameters, and follow the product instructions. Network Medium: Cat5 or better UTP cables(less than 120m),refer to the 6th product image for using;PoE input-1 RJ45 port, PoE output: 4 RJ45 port; If you only need 1-Port Input 1-Port Output POE Extender, you may refer to ASIN: B018TH31TC. PoE Standard: IEEE 802.3at (power-in),IEEE 802.3af(power-out);PoE Port Power: input power-25.5Watts,output power-24Watts;PoE Power Supply Type:1/2(+),3/6(-),Mode A,End-Span; NOTE: 1. Using high quality transmission cable which can transmit up to 100~120m,if using poor cable that will not reach to 80meters. 2.If the power consumption in front end device is too large, its working voltage may not be enough. 3.Cascading series too much, the voltage will be low, it also may not work. 4.Need to match with Poe switches as the last image.Strictly refer to poe extender Manual Guide to install the equipment,that will perfectly meet with your project requirement .