The order of cable connections is crucial for the proper functioning of the device. First, connect the power cable and BNC cable, and finally, connect the HDMI cable. Otherwise, the device may not work.. Note:The Input of This BNC to hdmi converter is Coax BNC,Not Coax RF. | HOW it work: Signal from CVBS security camera directly to an HDMI TV, or converts old security system DVR to HDMI device.NOTE: 1. It's only for CVBS analog camera, NOT for digital camera or AHD/TVI/CVI camera; 2. It's NOT an SDI converter, Not work for antenna and cable TV. | This bnc to hdmi adapter input:1.CVBS BNC analog video signal ,2.aux 3.5mm audio signal,output:HDMI output,it also have 720P/1080P switch. | SPECIFICATION: This adapter could detects PAL or NTSC signals automatically, supports 720P@50~60Hz, 1080P@50~60Hz HDMI output resolution, you can switch between 4:3 and 16:9 modes freely | Package Included:Coax to Hdmi Adapter,Power Adapter Included