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The H01 Bluetooth card can be used not only as a hands-free telephone but also as an alarm system. Once matched with phone, the card will give alarm when the distance to the card amounts more than 10 m. The energy-saving technology permits more than 60 days of standby time. Its stylish, lightweight, 6 mm thick and can be put in wallets, purses and other items to improve the safety of portable valuables; it can also be worn by the children to improve their security in crowded public places. It innovatively uses the Bluetooth technology features and opens new possibilities for its use.