Using the Roland V - 800HD is easy. First, connect your video sources to the appropriate inputs. For example, if you have an HD - SDI camera, plug it into one of the 4 HD - SDI inputs. Next, connect your monitors or recording devices to the outputs. You can use the HDMI multiview to monitor multiple sources at once. When using the device, make sure it's connected to the correct power supply that comes with it. Avoid exposing the device to extreme temperatures or humidity. For maintenance, keep the device clean by using a soft, dry cloth. Regularly check the connections to ensure they're secure. If you encounter any issues, refer to the user manual or contact customer support.