| 摘要 |
PURPOSE: An anti-theft alarm device for a bicycle is provided to detect the rotation of wheels, which is not intended by a user, and output an alarm message. CONSTITUTION: An anti-theft alarm device for a bicycle comprises a sensor(1), a magnet(2), and a main body(3). The sensor and the magnet detect the movement of a bicycle. When the theft of the bicycle is determined from the information transmitted from the sensor, an alarm message is output from a speaker of the main body. The theft is determined when the bicycle wheels are rotated differently from the intention of a user according to the specified number of rotation that is previously input by the user. |
