... interface, directly connected USB devicesBuilt-in headrest for Car/Taxi/Bus with adjustable pillarEbook reader function with all popular text ... , Low power consumptionCan be installed in different places (Car/Taxi/Busl)More customization possibilities (Storage/Battery/Car headrest/Functions/UI ... as well as server client software , each taxi can update the AD resources by 3G ,even wifi , SD card or LAN, ...