The HDMI bird watch camera has a 3-in-one connector which is being designed for vehicles. The DC power, video, and video will go through the single connector. The connector is weather (IP65) which can build used outdoor. You should keep the connection facing the ground to avoid any water lead back to the connector.
The 3-in-one connector doesn’t work with the BNC connector unless you have an adaption cable. We suggest you upgrade the whole connection as well as the traditional analog cable that may can’t handle high definition video. The 3-in-one cable is designed for high definition video transmission.
At the HMDI converter, you have BNC input and BNC output. The BNC input will receive the high definition video from the camera and the BNC output will provide the loop out for the second monitor. The HMDI output will be linking to your HDMI TV. It is important to know the audio will not able to transmit through the HDMI cable. You should have an external speaker to work with the audio from the camera.