Hi, I just received the tracker today. The functions work but as long as you are connected with bluetooth to your phone. I have an iPhone 8 Plus and the connection is broken every 5 minutes, then you have to start synchronizing and changing the settings all over again.
Order it for second time. I've lost the first one after more than a year of use, and it was just perfect for what I needed: simple, effective and precise. Love the series.