That Lenovo tablet with HDMI input is official, and it's a monster media machine
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Plugable Active DisplayPort to HDMI Adapter - Connect any DisplayPort-Enabled PC or Tablet to an HDMI Enabled Monitor, TV or Projector for Ultra-HD Video Streaming (HDMI 2.0 up to 4K 3840x2160 @60Hz) -
Phone Tablet as Camera Monitor with HDMI Adapter – theelectronichomestore
Phone Tablet as Camera Monitor with HDMI Adapter – theelectronichomestore
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Lenovo's new 13-inch Android tablet also works as a portable Switch display - The Verge
FA1016/C/T Integrated 10.1" HDMI Capacitive Touch Monitor - LILLIPUT Official Website
HP Pro Tablet 610 G1 PC HDMI Micro to HDMI TV Monitor 2m Gold Cord Wire Cable | eBay
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8 Inch 1280 * 720 Resolution Touch Monitor with HDMI input，USB 5V /12V – magedok-shop
Lenovo Android tablet apparently supports HDMI input - 9to5Google
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Connect a Samsung tablet to a monitor via a HDMI cable and the optional HDMI (HDTV) adapters - YouTube
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PORTKEYS LH5P 5.5" 4K HDMI Touchscreen Monitor with Camera
HDMI to VGA Adapter Smartphones / Tablet - Video Converters | StarTech.com
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This 5-in-1 HDMI dongle turns any phone, tablet, or computer into a second monitor - Yanko Design
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