Requires the Google Home app and a Google Account, for setting zones and alerts.
Works with compatible Google Assistant and Amazon
2-megapixel colour sensor
IR illuminator for night vision
Up to 1080p (1920 x 1080) at 30 frames/sec
Includes up to 3 hours of event video history or up to 60 days with Nest Aware subscription
802.11a/b/g/n/ac (2.4GHz/5GHz) Wi-Fi
On-device machine learning
Attached 3.0 m (10 ft) power cable with USB-A connector
Included 7.5W USB-A power adaptor
Indoor use only
See more technical details here.
Similar deal as before posted by @onebee
EDIT: Added link to Google Support page for technical details
So to be honest, you really need to have a subscription. 3 hours is a bit useless isnt it?