Although more expensive limited-edition mobile phones exist, the most expensive handset commercially available is the Ulysse Nardin Chairman, which also is the first mobile phone to contain a self-winding rotor mechanism, like an automatic watch, that supplies backup kinetic energy to help keep the battery charged. Running Google's Android operating system, models range from $13,000 to $50,000 (£8,600 to £33,000) for precious metal versions. The phone includes a lacquered wooden docking station with built-in speakers. It has a 3.2-inch touchscreen (81 mm), offers high-definition video playback, has 32 gigabytes of memory and an 8-megapixel camera.
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