From the press release and data sheet:
Microsoft Screen Sharing For Lumia Phones lets people simply beam content from their smartphone to a HDMI-connected screen like a TV, and enjoy their smartphone content on a larger screen, making it perfect for reliving memories with friends and family, or for sharing presentations at work.
Screen Sharing is designed for people who enjoy a lot of content on their phones – be it photos, videos, music, premium streaming movies, games, internet – and would like a simple, hassle-free way to get that same content onto a big screen for better viewing or for sharing with others.
With the smooth mirroring of everything on the phone on to a big screen, it can also be used for work. With a simple tap, people can work with documents and presentations and share them with a group.
The set-up process is interesting here, with a 'coaster' that comes with the dongle and which is NFC enabled, containing the ID of the dongle. So, on Lumia phones you just tap the coaster and you're paired and set-up and ready to 'share'/cast.
In practice, there are bound to be some latency issues - the datasheet does admit that action games won't provide a very good experience because of these delays.
The HD-10 is expected to be available in September 2014, and available from EUR 79 / USD 79.
Specifications:
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Dimensions
- Diameter: 80 mm
- Thickness: 21 mm
- Weight: 115 g
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Connectivity
- Other wireless connectivity: Screen projection, Wi-Fi CERTIFIED Miracast
- Charging connectors: Micro-USB
- AV connectors: HDMI-A
- NFC: Connecting
- Wi-Fi: WLAN IEEE 802.11 b/g/n, Wi-Fi Direct
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Usage
- Video resolution: up to 1080p (Full HD, 1920 x 1080)
- LED indicators: Power on indicator
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Audio
- Audio features: Up to LPCM 5.1 surround sound
As usual, there's a promo video (rather concentrating on what you can't do, rather than what you can do, but....!)