| 摘要 |
A user of a handheld device may be alerted to a possible risk of losing the handheld device. The handheld device is able to be secured to a carrying case. The carrying case may alert the user by activating one or more of its user interface elements. The handheld device may determine that a trigger condition has been met and transmit a signal indicating this to the carrying case. The handheld device may determine that a trigger condition has been met and may alert the user by activating one or more of its user interface elements. The handheld device and the carrying case may communicate via a wireless communication link according to a communication protocol, for example, a Bluetooth® standard, an RFID (Radio Frequency Identification) standard, a Zigbee„¢ standard or an ultra wideband (UWB) standard.
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