That Lenovo tablet with HDMI input is official, and it's a monster media machine
Amazon.com: KAMING 2-in-1 USB C Type C/Micro USB Android Phone to TV HDMI Cable, MHL to HDMI Adapter 1080P HD HDTV Mirroring & Charging Cable for All Android Smartphones Tablets to TV/Projector/Monitor,6.6ft :
Android TV Box Set Top HDMI Input with AV USB RU45 | eBay
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QMV HDMIV-C 6 foot USB-C To HDMI Digital AV Adapter for Android Phone Mirroring
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Amlogic T962E SoC Powers $55 Alfawise H96 Mini TV Box with HDMI Input, HDMI Output - CNX Software
Amazon.com: KAMING 2-in-1 USB C Type C/Micro USB Android Phone to TV HDMI Cable, MHL to HDMI Adapter 1080P HD HDTV Mirroring & Charging Cable for All Android Smartphones Tablets to TV/Projector/Monitor,6.6ft :
Sony adds HDMI to last year's Android phone, charges $2,500 | Ars Technica
Convert any Android phone into an HDMI monitor
How to connect your Android phone to an HDTV - CNET
How to Rename or Label HDMI input on your Android TV
Usb-C Type C To Hdmi Adapter Usb 3.1 Cable for Android Phone Tablet Black New - Walmart.com
Android Armada1500 support HDMI input PIP Overlay SDK API provide Google TV Passthrough Smart TV Box
Micro USB Type C HDMI Video Adapter Bluetooth Audio Cable fr Android Phone to TV | eBay
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HDMI Output and USB Input on Your Phone - YouTube
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How to connect your Android phone or tablet to your HDTV | TechHive
Connecting android device with PC using HDMI (video recording) - Android Enthusiasts Stack Exchange