Navman F20 3.5-Inch Portable GPS Navigator Large 3.5-inch touchscreen with reliable and accurate GPS navigation featuring SiRFstar III technology Compatible with optional T1 Traffic Pack for real-time, subscription-free traffic updates Fuel and Park buttons to help you quickly find somewhere to park or fill up The rechargeable Li-ion battery lasts up to 3.5 hours depending on use Advanced motorway navigation with route summary view and Pause Journey functions.