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First of all: to use this tracker (as many GPS trackers) a SIM card with data volume is necessary. The big problem is the application 365GPS !!! For Android and iOS, the current version 3.09 login is not possible!!! Nothing´s happens!!! Only versions to 2.20 (you have to search for download as .apk in the www), works fine. For the Windows application, the page www.365gps.net is not certified - who may log in anyway ... Without a functioning APP the best tracker is unusable! The tracker itself performs its service satisfactorily, the connection to the GSM-antenna is a bit too short and tends to tear off, if you bend it backwards. But this tracker is used only for installation ;-) The weight is 6,9g(!) without battery (not ~25g)
I use it for my quadrocopter and airplane. Connected to 1s LiIon battery.