Simvalley GT-280 GPS Tracker - GPS Location with Google Maps, GSM Location, Geo-fence and SOS Emergency Features Use the GSM mobile network with our free Online Tracing Tool when no GPS signal is available Easy tracking with your mobile phone by text messages with a link to Google Maps SOS Emgergency Calling, Geo-fencing, E-mail Fowarding, Sleep Mode, Status Check NO additional service fees! Low operating costs from any SIM card using only SMS Slim and compact design allows it to be easily hidden