... the most popular operating system in the world and includes true multi-tasking, widgets, and many more features that cant be found anywhere else. Best ... : V2.1, EDR class 2, A2DP GPS/AGPS: built-in Battery type: Rechargeable polymer battery, 3.7V 4250mAh, 15Wh. ... One year 2) Customer bear all the freight and duty charge to factory, and the factory take the responsibility of return freight charge.