This works a treat for powering a webcam via Cat 5 cable. It removes the requirement of having a power supply adjacent to the camera. The quality also looks good. Check the power connector suits your camera. I had to purchase a reducer to fit my camera which was half the price of the injector/extractor.
It works fine with my 12 volt IPcamera. The power connectors are for 12volts so check the size if you are using 5 volt equipment. It is completely passive so will work with any voltage so long as the power connectors are the right size.