ST903 is a GPS and GPRS tracker. It has a built-in battery of 1050mAh. It is not waterproof. You can keep it in your vehicle, bag, purse, briefcase, and box; to track the location of your stuffs. You can also use it to track your dog by attaching it to your dog's collar. This GPS tracker is easy to setup and install. You can track it from Google map or Sinotrack app. Installing a tracker in your car will help you easily locate your car in theft cases.

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