This unit is a Blackmagic Design HD MultiView 4 device, but it doesn't come with a power supply.

How to use: First, make sure you have a suitable power supply. Connect the device to your system according to the connection diagram. Then you can start using it to monitor video. Notes: Since this device doesn't include a power supply, you need to prepare one yourself. Make sure the power supply voltage matches the device requirements. Maintenance advice: Keep the device in a dry and clean environment. Regularly check the connection cables to ensure they are in good condition. If there are any problems, contact customer service in time.