where can I get a power supply for this?

how can it been powered, AC ADOPTER OR BATTERY

Can I use it to connect my AV receiver and a projector?

You can hook up any device that has an HDMI output with the dongle, and to your projectors HDMI input, all the setup and communication is done thru the transmitter and receiver.

what country is the Nyrius NPCS549 manufactured in?

The sticker on the back of my transceiver shows Taiwan

Can it stream reversed, to stream whatever is on the tv to a chromebook? My tv has some apps that chromebook doesnt support and I want to watch from bed.

No it cannot, the tv has no output HDMI, the transmitter is a one way signal.

Questions & Answers: Nyrius ARIES Prime Wireless Video HDMI Transmitter & Receiver for Streaming HD 1080p 3D Video & Digital Audio from Laptop, PC, Cable, Netflix, YouTube, PS to HDTV/Projector (NPCS549)

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Nyrius ARIES Prime Wireless Video HDMI Transmitter & Receiver for Streaming HD 1080p 3D Video & Digital Audio from Laptop, PC, Cable, Netflix, YouTube, PS to HDTV/Projector (NPCS549)

Wirelessly stream true 1080p high definition 3D video & digital audio to your TV or projector. Watch movies & TV shows from your laptop, PC, Mac, A/V receiver, gaming console, cable/satellite
Transmitted signal is crystal clear, able to stream uncompressed HD video & audio with ease. Signal experiences zero latency (real time) even when streaming 3D video to a 1080p device
Easy to install plug 'n play set up eliminates the need to install expensive, inconvenient cables. No software or WiFi connection required. Transmitter: 1 x HDMI input, Receiver: 1 x HDMI output
High performance digital signal transmits through walls, ceilings, & floors (streaming line of sight results in maximum 30ft range)
Compact low profile design makes it perfect for laptops and works with any HDMI video device

$199^.99 –