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This is a wireless caution of system. When it happened car accident, it can remind the car within one kilometer around to pay attention, and slow down. It may be via
G-sensor, to detect to car accident a shock. And through the signal transmitter to send the signal. So that within a certain range of the vehicle can receive the signals. Similar vehicles equipped with an additional tire pressure sensors, it can be installed any car. To remind within fixed range of vehicle, and slow sown.