does it come with either POE power injector or AC power adapter?

comes with A/C power. It supports POE but you have to supply the POE injector or connect to a POE switch.

Is a POE injector required to make this unit work?

You can use a POE switch or injector. But you can also use local power (PoE or External 12VDC / 1.5A Power Supply). It does come with the 12VDC adapter in the box.

Is it version 3 or version 1?

Printed on the device label it says version 1.2. The Linux kernel version is 3.3.8.

Questions & Answers: TP-Link EAP245 AC1750 Wireless Dual Band Gigabit Ceiling Mount Access Point

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TP-Link EAP245 AC1750 Wireless Dual Band Gigabit Ceiling Mount Access Point

Simultaneous 450 Mbps on 2.4 GHz and 1300 Mbps on 5 GHz totals 1750 Mbps Wi-Fi speeds
Free EAP Controller Software lets administrators easily manage hundreds of EAPs
Support Power over Ethernet(802.3at) for convenient and affordable installation
Captive portal provides a convenient method for guest authentication
Band Steering Automatically moves dual band devices onto the wider 5GHz band for faster connections
Load balance ensures large numbers of users have smooth network experiences in high density business networks

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