| 摘要 |
A tire theft alarm system is provided with a vehicle-mounted device (3, 4) mounted in a vehicle (10), and a portable device (30) carried by a user of the vehicle. When a main power supply of the vehicle is off, the vehicle-mounted device transmits a radio wave including a first alarm on the basis of the fact that there has been a change in the air pressure of a tire (1a-1d) fitted to the vehicle or acceleration applied to the tire, which was detected by a sensor transmitter (2a-2d) for detecting and transmitting the air pressure of the tire or the acceleration. The portable device provides alarm notification to the user on the basis of having received the radio wave including the first alarm transmitted by the vehicle-mounted device. |
