Cat5e balum with power question?

[hxdrummerxc 0]

Im trying to upgrade my current all analog cctv system. I just ordered a tribrid HDCVI DVR so that I can use HDCVI cameras and also still use my old analog cameras until I can afford to upgrade them all.

 

Anyways, I was planning on running cat5e for the new HDCVI cameras that I install. I was looking at these Cat5e Balums with power:

http://www.amazon.com/VIMVIP-Converter-Connectors-Security-Surveillance/dp/B00QUJZWQM/ref=sr_1_13?s=electronics&ie=UTF8&qid=1435953940&sr=1-13&keywords=cat5e+power+balun

 

My question is, how does the power work on these?

Will these inject power into the cat5e cable (Power over Ethernet?) For instance, I plug the BNC end of the balum into my DVR, and plug one of my 12v power leads into the power end of the balum, will it then send power through the Cat5e cable?

 

I just wanted to make sure that is how this works before I buy them.

 

Thanks