An identification token such as a proximity payment device may be integrated with a wristwatch. For security purposes, the identification token may be disabled when removed from the user's wrist. The identification token may be re-enabled by interaction with a docking station or personal computer at...http://www.google.com.hk/patents/US20080235144?utm_source=gb-gplus-share專利 US20080235144 - Pre-authenticated identification token
