Automotive electronics are generally categorized into four sectors: entertainment, communications, information and productivity. The major items include in-car bluetooth handsfree devices, satellite radio subscribers, DVD entertainment devices, telematics tracking devices and GPS navigation. Also included are collision warning devices, drowsiness monitors, night visions, tier pressure warning devices, lighting, rain sensing wipers, HVAC, window lifts, electronic sunroofs, power seats, electronic mirrors, power doors, body control modules, trip computers, head-up displays and even more. In 2006, the market demands for bluetooth handsfree sets were 3.68 million sets and are expected to soar to 11.4 million sets by 2010; satellite radio subscribers were 11.9 million sets and are expected to jump to 19.8 million sets by 2010; telematics tracking devices were 3.2 million sets and are expected to surge to 16 million sets by 2010 and GPS navigation were 10 million sets and expected to climb to 17.7 million sets by 2010.