The ST121HDBTPW is video extender kit enables you to extend HDMI audio/video up to 330ft (100m) over a single CAT5e/6 cable. For added versatility, the extender kit supports power over cable (POC), which allows power to be sent over the CAT5e/CAT6 cable, powering both the transmitter and receiver with just one adapter. To help you save installation costs, the extender kit can be installed using new or non-existing non-proprietary Ethernet infrastructure wiring with the included mounting brackets. Plus, with support for high-definition resolutions of up to 1080p and 4K plus the accompanying digital audio, the HDMI extender lets you get the most of your high-end A/V equipment.