OdiySurveil(TM) 1-Port In-out 10/100M IEEE802.3af PoE Extender for Ethernet USE PROPERLY: The PoE Extender can only be used for CCTV IP network camera PoE data extension and amplification (CAN NOT TRANSMIT HOME NETWORK OR OTHER NETWORK CAMERA SIGNAL). BEFORE YOU INSTALL IT,PLEASE CAREFULLY READ ITS INSTRUCTION IN THE PACKAGE. USING IN WRONG APPLICATION ENVIRONMENT MAY CAUSE NO WORK. FOR THE DEVICE TO ACHIEVE YOUR DESIRED RESULTS, DO NOT CONNECT "input" AND "output" PORT REVERSELY.PoE input-1 RJ45 port, PoE output: 1 RJ45 port; (If you only need 1-Port Input 4-Port Output POE Extender, you may refer to ASIN: B0198H6EUK)Suggest to use this poe extender indoors with waterproof housing. Network Medium: Cat5 or better UTP cables,less than 120m;Before installing,refer to your product manual guide and the installation guide as the last product image show. ALL EXTENDERS SELL AFTER PASSING STRICT TEST AS THE 4TH IMAGE SHOW. PoE Extenders can increase the transmission distance for Ethernet data and PoE power up to 120m via Cat5 UTP cables. It offers you great flexibility to extand the distance of PoE; 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 .