Streetwize SWTRACK1 Vehicle and Personal Compact GPS Car Van Bus Taxi Tracker. How to use: Insert your Sim. Charge up the tracker or connect to a vehicle battery or vehicle in use. Send the tracker a text message from your mobile phone and it will reply with a map with the GPS location. Free SIM card supplied in each box , together with a number to call and add credit making the customer experience very simple (no need to go out and buy and SIM and find ways to top it up). Simple to use and Subscription Free (TOP UP REQUIRED). Compact Size, Track Cars, Vans, Children, Pets and much more. The Streetwize Vehicle Tracker is an in-expensive and easy to use solution that doesn't require any complicated installation or annual subscriptions. The portable nature of the GPS tracker makes it easily transferrable between cars, caravans, trailers and more. All you need to do is top up the supplied SIM card to provide the Internet connection your tracker needs to provide location information. Once charged this can last up to 24-36 hours. If this is plugged in there a continual charge.