To use this Blackmagic Design MultiView 4 HD, you need to connect it to an external power source as it doesn't have a power supply. First, connect your devices to the appropriate input ports. Then, use the control panel to adjust the view settings according to your preferences. When using, make sure the external power source is stable to avoid malfunctions. For maintenance, keep it in a dry and cool place. Regularly clean the device with a soft, dry cloth to prevent dust accumulation. If you encounter any issues, check the connections first and then contact customer support if needed.