| 摘要 |
The present invention relates to an electronic device including a mini-transmitter having a limited radio range and being attached to the bunch of keys, as well as a mini-receiver which is provided with, inter alia, an alarm that is triggered when the mini-receiver is outside the radio range (by means of an electromechanical relay). The mini-receiver of said device according to the invention can also be installed on a mobile telephone, or smartphone.
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