A composite material includes a first phase which comprises LixMyz wherein M is at least one metal, y and z are independently 0, and x is less than or equal to 1. The front derailleur mounting member is configured to be mounted to a bicycle frame. This 8-lines camera data is YUV-converted by a signal precessing circuit. In one operating embodiment, a selected address line may be driven to a selection voltage, and the address lines of the odd or even designation which is the same as the selected address line are allowed to float. The angular velocity detection device allows the angular velocity converter to use the corrected sensitivity coefficient to calculate each actual angular velocity of the mobile unit.