A sitting type exercise machine has a frame, a flywheel, and an alternative driving device. A photochromic material comprising an illuminant which emits a light when irradiated with a radiation and a diarylethene photochromic compound having a specific structure, and a color dose meter employing it. The airbag restraint system further includes first and second inflators for dual mode airbag cushion deployment. If so, the device may include a comparator unit, in which the first signals are compared with reference signals. Also disclosed are methods for making and using the compositions. The electrolyte contains a carboxylic acid salt.