With ST3940B standalone GPS tracker and his (IP67 - waterproof) certification, you can cover any requirement type in the asset tracking on extreme weather conditions without fear that your Suntech GPS tracker stop working. You can select 3 tracking modes in Suntech ST3940B tracker: (using Suntech online server, from an external tracking management platform "edit default IP/port", sending commands with SMS text messages), you can change the tracking modes via PC or by SMS. To protect the mobile asset on where install an ST3940B GPS tracker, can setup the follow preventive "SMS alerts": (virtual geofences alert, Jamming detection alert, low battery alert), when Suntech GPS tracker detect one of these events sending the "SMS alerts" to a mobile phone. Suntech ST3940B offers up to "200 circular virtual geofences" that you can config depending of your needs, thanks to "virtual geofences" increasing your high value mobile asset protection. Suntech include the (OTA - Over the Air) function in ST3940B standalone GPS tracker, with the (OTA) function you can edit config parameters or update firmware remotely without uninstalling the GPS tracker of your mobile asset.