Question 1

What radius does it cover as a wireless access point?

Accepted Answer

I'm not for certain, I would be a proper authority for answering your question.

So, I use my setup to get wireless and/or wired internet access between my primary internet access router/modem and a secondary access point, in my other building.

In my particular setup, I have both of the devices pointed directly inline with one another at a distance of 98 meters. My intention was that, I DID NOT want to run a LAN/Ethernet cable between two buildings for internet access.

Another way of answering this question, is that; I believe these are designed too be "Wireless Antenna" but not necessarily "Wireless Area Coverage" devices.

I'm sorry that I could not be more specific about you question of radius.

Question 2

Does this come with a POE injector?

Accepted Answer

To power  the device  yes

Question 3

Is this compatible with 
Ubiquiti UBI-NSM2US NanoStation M?

Accepted Answer

Not really familiar with the Ubiquiti product but looking at the specs it seems to be designed for the same applications as the TP-Link and has the same features.  So I'd say yes, in virtually all applications it would be fully compatible.  
Both manufacturers do offer some special modes that you can opt to enable that in some cases supposedly will improve throughput between other units of the same brand in point-to-point applications, those modes might not be available if you are linking different brands, but their use is optional anyway.

Question 4

Is this thing a substitute for a wifi range extender? How does it work? I wan to provide wireless coverage to a shed that is about 200 ft from the router and I cannot run a cable. Will it work with any router or just one from TP-LINK?

Accepted Answer

should work from any router, but to do what you are wanting you will need two.  This is how I used it, connect NON-TPlink router to the first one created a network between the two devices then connect a wireless Access Point on the other end.  This work flawless.  These are line of sight so if you have anything in the way it may affect it.  Speed was great.  I will use them again.

Brand	TP-Link
Model	CPE210

Standards	IEEE 802.11b/g/n (with Pharos MAXtream disabled)
Wireless Data Rates	Up to 300Mbps
Frequency Band	2.4 GHz - 2.483 GHz
Antenna	Built-in 9 dBi 2x2 Dual-polarized Directional Antenna Beam Width: 65 degree (H-Plane) / 35 degree (E-Plane)
Transmitted Power	27 dBm / 500mw (Adjustable power by 1 dBm) Note: Maximum transmission power may vary across different channels depending on the limitations of the countries or regions in which the device is used.
System Requirements	Microsoft Windows 98SE, NT, 2000, XP, Vista or Windows 10, Windows 8, Windows 7, MAC OS, NetWare, UNIX or Linux. Note: We recommend you to use one of following Web browsers for an improved user experience: Google Chrome, Safari, and Firefox. IE browsers are not recommended.
Interface	1 x 10/100 Mbps Shielded Ethernet Port (Passive PoE in) 1 x Grounding Terminal 1 x Reset Button PoE Adapter: 1 x AC Jack with Ground 1 x 10/100/1000Mbps Shielded Ethernet Port (Power + Data)
Buttons	PoE Adapter: Remote Reset Button

Temperature	Operating Temperature: -30 ~ 70 degree Celsius (-22 ~ 158 degree Fahrenheit) Storage Temperature: -40 ~ 70 degree Celsius (-40 ~ 158 degree Fahrenheit)
Humidity	Operating Humidity: 10% ~ 90% non-condensing Storage Humidity: 5% ~ 95% non-condensing

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Item#: N82E16833704231