ElectroFlip iTrack 2 GSM GPRS GPS Portable Tracker - Sim Card Fee Based &lt;b&gt;Uses Cellular and GPS Technology&lt;/b&gt; - Designed to be used in conjunction with cell towers and GPS satellites, all you will need to operate this simple beauty is a pre-paid SIM card. The iTrack 2.0 uses up to 32 satellite channels and cellular towers for accuracy within 10 feet. &lt;b&gt;2 Month Battery Life &lt;/b&gt; - The iTrack 2.0 comes equipped with a long life Lithium-Ion battery that last up to 2 months on a single charge. Yet it takes only 6 hours to recharge (12 hours for the first use). &lt;b&gt;Amplified GPS & Cellular Antennas&lt;/b&gt; - If you're looking for stonger reception in rural areas, these antennas will amplify the signal by more than double the average tracking devices capabilities. &lt;b&gt;Multiple Tracking Modes&lt;/b&gt; - You have the option of setting your iTrack 2.0 to report its location as often as every 10 seconds or every 4 hours - it depends on how often you want the iTrack 2.0 to report its precise location. You can also use the On Demand tracking feature - the iTrack 2.0 only reports its location when prompted - to extend battery life. &lt;b&gt;Geo-Fencing&lt;/b&gt; - Have a wiley teenager? You can pre-set a Geo-fence zone to alert you every time Timmy the Teenager goes outside a specified zone - Timmy will never be able to go to the wrong side of tracks without your knowledge. Zones can be as big or as small as you want them to be - you decide what is "off-limits".