Abstract: A blind spot detecting device comprises a detecting module, which is connected to a rear end of a motorcycle and includes a left sensor and a right sensor on its rear left side and rear right side respectively, for detecting approaching objects at a rear left side and a rear right side of the motorcycle at an angle respectively, and transmits respective signals to a circuit board; and a signal displaying module, which is electrically connected with the circuit board and includes a left signal displaying unit and a right signal displaying unit provided respectively on two sides thereof for receiving the respective signals indicating there are objects approaching to the rear left side and the rear right side of the motorcycle from the left sensor and the right sensor and providing warning signals.

Abstract: A hanging-type head-up display device comprises a projection device and an extension portion. The extension portion is connected to a support that is connected to a front end of a head of a motorcycle. The projection device includes a projection camera for projecting an image in a forward direction away from the head of the motorcycle onto a display screen provided in front of the head of the motorcycle.