Guardfreight E-Containerlock is it also a "standalone GPS tracker" with rechargeable Li-Ion 9300mAh battery that can during up to 1.5 years with a single charge reporting one position a day, to recharging the battery of E-Containerlock only need connecting USB charger to mini USB port. For improve the safety in the (sea/land) GPS container tracking, E-Containerlock GPS padlock allow config preventive "SMS alerts": (padlock activation, container opening, padlock removal, padlock low battery, tamper), the Guardfreight GPS tracker send the "SMS alerts" to a mobile phone. Guardfreight E-Containerlock accept 2 GPS tracking modes: (using the sever of Guardfreight company, from an external tracking management platform "edit default IP/port"), also accept commands through SMS text messages. E-Containerlock is a good "anti-theft system" that protect your high valuable mobile asset and increase control in your daily GPS container tracking. Guardfreight include in the E-Containerlock GPS padlock the (OTA - Over the Air) function, that allow update firmware or edit config parameters remotely without uninstalling the unit of your (sea/land) container.