Integrating Ethernet support into your project is a great way to relay data through a local area network and even bounce information out to the internet. Sometimes it's hard to get power to your Ethernet devices. Wouldn't it be convenient to use the same cable for power and data? Using these power over Ethernet adapters, you can do just that!
Each cable has a female RJ45 on one side which is adapted to a male RJ45 and 5.5x2.1mm barrel jack connector on the other side. The 'injector' cable has a female barrel jack connector and the 'splitter' cable has a male barrel jack. Simply attach the cables at each end of your network cable, plug the male barrel jack from the splitter into your target device and plug your power adapter into the injector. Now you can use one cable to provide both power and data for your Ethernet enabled device.
Note: This is NOT a true 802.3af power injector, it just puts DC onto the unused pair of conductors in the cable. It will work in pairs to get power from one end of an Ethernet cable to the other, but may not work with devices that require true 802.3af POE.
Note: You are getting a set of two cables.
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When setting up cameras either inside or out, without these you are continually looking for a place near an outlet in order to have power. These provide a way to power up your camera near the router and indoors, and allows you to place the camera where it is best needed. Other companies sell 50 foot cables with this built-in, but that does not always work if you need a 20 foot cable or a 90 foot cable. The only improvement I would suggest would be weatherproof connectors on the ethernet end, But black electricians tape or a small amount of silicon works great.