Specification: Item Type: Mixer_x000D_Material: Metal_x000D_Front Interface: 2 x Mic Input, 3.5 Sound Interface_x000D_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_x000D_Support: Convert 1080P or Lower Video to 4K 2K Size and Display on 4K 2K TV_x000D_Working Voltage: DC 12V_x000D_Plug Voltage: AC 100-240V 50-60Hz Features: 1Principle: 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. 2HD Display: This Digital Mixer converts 1080P or lower video to 4K2K size and displays it on 4K2K TV. 3Adjustable sound: This HD multimedia interface Mixer has a built in sound processor for adjusting higher level sound and is rugged. 4Multipurpose: The mixer can be used with 4K source players and 4K TV monitors. Operating voltage is DC 12V. 5Applicable: Suitable for a variety of devices, such as for Android TV boxes, for Android set top boxes, DVD players, HD multimedia interface dongles, laptops, computers, etc. PackageList: 1 x Mixer 1 x Plug 1 x HDMultimediaInterface cable 1 x RCA cable 1 x Manual