Why would someone use this key module instead of the UniFi controller software on a laptop? What are the pros or cons?

I use the controller to be able to log into the UniFi controller from any computer or the mobile app. I am often at different computers and it is much easier for me to connect to one IP address than to always go back to the computer where the UniFi software was loaded and is running.

What are the pro's con's on the gen2 vs the gen2 plus?

The gen2 Plus has a built-in hard drive to allows it to support up to 20 Unifi Cameras and 1 TB Storage (Upgradeable to 5 TB) to use as a NVR.

What power adapter would you recommend for usb-c power? 2amp?

It depends. Generally you would only buy one of these if you have other Unifi devices on your network. A lot of those devices supply (or require) power supplied by POE. In the long run, POE is a lot simpler than having power adapters for every device. At first I thought POE was a gimmick, but as soon as I saw it working I was hooked. I plan to use a Unifi POE Switch to provide the power, which means I don't need to supply power by USB-C. It also has an internal battery, so you probably don't need to supply redundant power. I plan to put the POE switch onto a UPS anyway, so that should be reliable enough for this. If you decide to use USB-C power, the Unifi site lists it as USB-C 5 V 1 A, with a max power draw of 5 Watts. Therefore, you don't need a 2 Amp charger. The more power hungry Gen2 Plus has a max power draw of 16 Watts, but still works with a 1 Amp supply.

Does this come with a microsd card like the g1 version?

I can confirm that the Gen2 does not ship with the microSD card, even though Ubiquiti's marketing materials say that it is included. In fact, this device comes with very little. No power supply, no power cord (803.af PoE), no ethernet cable, no microSD card. But, they spent a fortune on the very Apple-looking box it was delivered in. Not impressed.

ASIN	B07K1G7WH2
Additional Features	WPS
Best Sellers Rank	#19,105 in Computers ( See Top 100 in Computers ) #91 in Wireless Access Points
Brand	Ubiquiti Networks
Built-In Media	1TB 2.5'' Hard Drive
Cache Memory Installed Size	2000
Color	Black
Compatible Devices	Camera
Connectivity Technology	Ethernet
Connectivity technology	Ethernet
Customer Reviews	4.6 out of 5 stars 865 Reviews
Data Transfer Rate	48 Gigabits Per Second
Digital Storage Capacity	1024 GB
Digital storage capacity	1024 GB
Enclosure Material	Metal
Form Factor	2.5-inch
Global Trade Identification Number	00817882024525, 04250605513610
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	2.5 Inches
Hard Disk Interface	Ethernet
Hard disk form factor	2.5 Inches
Hard disk interface	Ethernet
Hardware Connectivity	Ethernet
Installation Type	External Hard Drive
Item Type Name	NETWORKING_DEVICE
Item Weight	172 Grams
Item height	1.07 inches
Manufacturer	Ubiquiti Networks, Inc
Model Name	UCK-G2
Model Number	UCK-G2
Number of Items	1
Special features	WPS
Specific Uses For Product	Multimedia
UPC	817882024525
Unit Count	1 Count

Ubiquiti Networks - UniFi Cloud Key Gen2 (UCK-G2)

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