| 摘要 |
PURPOSE: A close range communication type accessory device combined with no missing, a call function and a search function for a mobile phone are provided to reduce the cost caused by the exchange of a battery by adopting a Zigbee mode of a low power NFC method. CONSTITUTION: A master device(100) comprises a wireless antenna, a wireless communication module, and a high frequency electromagnetic field recognition sensor. A slave device(200) paired with the master device includes the wireless antenna, the wireless communication module, a control switch, a display device, a vibrator and a sound output device. The electromagnetic field between the master device and the slave device is sensed in real time to prevent the loss of a cellular phone. |
