It offers 4G tracking solution for every trailer truck that supports it. It has an embedded feature inside that can record the data inside its memory when there is no internet, and can send them again when it goes online. More over, it can immobilize a vehicle remotely by cutting off all the power with relay
2G tracking solution for trailer/semi trailer trucks. What differientiates this device from the SM11A-4G is that SM03-A has 2G feature instead of 4G other than that, it has the same features as SM11A-4G.
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