Welcome to our store! 1. Principle: Amplifies and echoes sound from an external microphone, mixes it with the original sound, and outputs it via the HD multimedia interface port, including video and audio. 2. HD Display: This digital mixer converts 1080P or lower video to 4K2K size and displays it on a 4K2K TV. 3. Adjustable Audio: This HD multimedia interface mixer features a built-in audio processor to adjust higher sound levels and is robust. 4. Versatile: The mixer can be used with 4K source players and 4K TV monitors. The operating voltage is DC 12V. 5. Applicable: Suitable for a variety of devices, such as Android TV boxes, Android set-top boxes, DVD players, HD multimedia interface dongles, laptops, computers, etc. Item Type: Mixer Material: Metal Front Interface: 2 x Microphone Input, 3.5 Audio Interface Rear Interface: 1 x HD Multimedia Interface Input, 1 x HD Multimedia Interface Output, 1 x AV Input, 1 x AV Output, 2 x Sound Input, 2 x Sound Output Support: Converts 1080P or lower video to 4K 2K size and displays on a 4K 2K TV Working Voltage: DC 12V Plug Voltage: AC 100-240V 50-60Hz 1 x Mixer 1 x Plug 1 x HD Multimedia Interface Cable 1 x RCA Cable 1 x Manual