HD Multimedia Interface Mixer 4K 1080P DC 12V Adjustable Sound Microphone Amplifier                       Feature:     1. Principle: Amplifies and echoes sound from an external microphone, mixes it with the original sound, and outputs it through the HD multimedia interface port, including video and sound.      2. HD Display: This Digital Mixer converts 1080P or lower video to 4K2K size and displays it on 4K2K TV.      3. Adjustable sound: This HD multimedia interface Mixer has a built in sound processor for adjusting higher level sound and is rugged.      4. Multipurpose: The mixer can be used with 4K source players and 4K TV monitors. Operating voltage is DC 12V.       5. Applicable: Suitable for a variety of devices, such as for Android set top boxes, DVD players, HD multimedia interface dongles, laptops, computers, etc.             Specification:                    Item Type: Mixer  Material: Metal  Front Interface: 2 x Mic Input, 3.5 Sound 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: Convert 1080P or Lower Video to 4K 2K Size and Display on 4K 2K TV  Working Voltage: DC 12V  Plug Voltage: AC 100-240V 50-60Hz                           Package List:      1 x Mixer       1 x Plug      1 x HD Multimedia Interface cable      1 x RCA cable      1 x Manual                 How to use:            1. Insert the power supply into the power supply sleeve of the device.              2. Connect the HD multimedia interface cable or RCA cable from the source device (such as a DVD player, laptop or tablet) to the device.              3. Plug the HD multimedia interface cable or RCA cable into the TV or speaker.              4. Connect the microphone cable into the microphone jacket.              5. Play MTV music, sing along with the song, and use the front knob to adjust the effect.