Patent ID: 7030740

Claim:
A multifunction car theft alarm lock with tire pressure sensing device used in a transportation vehicle, comprising: a T-shaped lock unit having a coupling adapted to couple the lock unit to a steering wheel of a transportation vehicle; a digital electronic lock operably connected to said coupling to selectively release said coupling from the steering wheel; a key insertable into the lock unit for releasing the coupling; a sensor module with a plurality of sensing functions, including an infrared sensing function, a horizontal motion sensing function and a vertical motion sensing function, used to detect a status of the transportation vehicle and to output a signal of detection when the status of the transportation vehicle has been changed; at least one tire pressure sensor for detecting a status of a tire pressure of the transportation vehicle and for transmitting a signal of low pressure if the tire pressure drops below a predetermined pressure value; an electronic module including the sensor module installed in the lock unit, for inputting the signal of low pressure and outputting the signal of detection and the signal of low pressure to a far end; a setting device adapted for receiving the signal of detection and the signal of low pressure, the setting device providing a sound and lighting effect corresponding to each of the signal of detection and the signal of low pressure; a power supply unit for providing a necessary working power to the lock unit and the electronic module; a standby power set for providing a standby power supply; and a standby power circuit for providing the standby power supply to the lock unit and the electronic module if the power supply unit fails.