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In this paper, the Murata ceramic Bluetooth antenna, which has been successfully used on rigid printed circuit boards, is now applied to flexible printed circuit boards. Based on this Bluetooth antenna, a novel wrist device that can be wirelessly connected to mobile phones is developed. In particular, to reduce the height of the wrist device, the ground-clearance type Murata Bluetooth antenna is adopted. It is demonstrated that the wrist device works very well in real environments.