This device integrates with the Garmin ecosystem so the watch can trigger tracking and well as SOS and other features. This device also pairs with my smartphone so I can use the smartphone UI to create, send, read messages and other functions. Using the smartphone is very handy as it has a nice big screen and I am very used to interacting with it versus learning a new UI that is far smaller. The device uses a Messenger app to connect and interact with the device. The device can be used stand-alone though which is great. If for some reason I did not have my phone I could still communicate.
I had read some reviews about this device as it was just coming out. One of the pro's was great battery life. I have found the battery life to be stellar actually. I am writing this article in April and I have not charged it since last year. It is still over 70%. I use the device about 3 hours a weekend most weekends, year round.
Messaging is pretty simple and it can automatically switch between WiFi, Cellular, and Satellite as needed to minimize satellite charges. I have never used all my messages in a month. It also sends my location every 10 minutes so my family can see where I am regardless of cellular connection. This is great for safety.
Overall I would highly recommend this device for people who like to go places where there is no cellular.