Patent ID: 6861948

Claim:
A vehicle wireless alarm system comprises a front car subsystem installed in a front car and a rear car subsystem installed in a rear car; the front car being in front of the rear car; wherein the front car subsystem comprising: a reverse car sensor and a brake car sensor; an alarm source receiving signals from the reverse car sensor and the brake car sensor; an oscillator receiving signals from the alarm source for mixing the receiving signals with carriers signals; an encoder receiving signals from the oscillator for encoding the receiving signals; an amplifier receiving signals from the encoder for amplifying the input signals to have a larger power for transmission; and a transmitter for receiving the signals from the amplifier for emitting the receiving signals wirelessly as emitting signals; the rear car subsystem comprising: a receiver receiving the transmitting signals from the transmitter; an amplifier receiving signals from the receiver for amplifying the signals; a decoder for receiving signals from the amplifier for decoding the receiving signals; an output device receiving signals from the decoder and outputting the receiving signals; and an alarm device receiving signals from the output device and emitting alarm signals; wherein by above system, a driver in the rear car knows that the front car now reverses or brakes.