For providing you more security and satisfaction, Buffalo Japan has built a perfect security system that will connect a  security card to the PC  via Bluetooth 4.0 . So that, it will automatically log in users to their workstations and whenever user moves out of the proximity range of 25 meters this security card will also log off him automatically for better security. But only Japanese users can enjoy the benefits of this security card.  They can buy both the card and the dongle by spending 5300 Yen ($ 66). As far as security is concerned, then it is worth to spend this much amount for this security card.

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You can get More info here @ Buffalo Japan