Do you need a power adapter if you hook this to a POE NVR?

Nope, it will draw power from the poe enabled nvr

Questions & Answers: 1080P 2MP HD IP PoE Hidden/Spy Security Camera With Built-In MICROPHONE: 3.7mm Wide Angle Lens, 48x 940nm "Invisible" IR LEDs For Nightvision, ONVIF Certified, P2P/Mobile View

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DiySecurityCameraWorld
Item#: 9SIA7P54ZT9774
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1080P 2MP HD IP PoE Hidden/Spy Security Camera With Built-In MICROPHONE: 3.7mm Wide Angle Lens, 48x 940nm "Invisible" IR LEDs For Nightvision, ONVIF Certified, P2P/Mobile View

1080P(1920*1080), 2.0MegaPixel
3.7mm Wide Angle Lens
Onvif: 2.0
48PCS 940nm invisible IR Glow LED (NO Red Dot)
P2P APP: XMEYE
Built-in Audio
Power:12VDC/PoE (adapter not included)

$80^.95 –