Which Arlo Pro, Ultra and Go cameras should I buy?
Arlo's battery lines are the Pro (Pro 6 and Pro XL 6), the Ultra (Ultra 3) and the Go (Go 2).
They run on rechargeable batteries. The Pro 6 and Pro XL 6 record 2K and work without a SmartHub. The Ultra 3 records 4K and needs a SmartHub. The Go 2 adds LTE for places without Wi-Fi.
Arlo lists Alexa, Google Home, SmartThings and IFTTT for the Pro 6, Pro XL 6 and Ultra 3.