FIELD: machine building.
SUBSTANCE: invention relates to vehicle safety systems. Trinket comprises first and second transceivers and communication unit. Transceivers communicate in different first and second frequency bands. Communication unit is designed to transmit the first message to the vehicle through the first transceiver in response to activation of the first button and in response to the absence of reception of the second message from the vehicle through the second transceiver. Second transceiver generates an alert and transmits to the vehicle the third message including the request for repeated synchronization through the first transceiver.
EFFECT: improved vehicle safety.
23 cl, 5 dwg
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