When in sms-mode my tk102-2 will alert me when the battery is low.
In gprs-mode, these messages are send as data traffic to the server.
I guess that by using the parameter notification in the commercial version one would achive this, but as this is an essential function for the tracker (alerting that it is about to go offline) I would really like to see it implemented for personal use as well.
I really like the website and the functions (like geofences), but not getting the basic information that my tracker is about to go offline is a deal-breaker for me when it comes to reliability. It would then be safer just to use the sms-functions.