A method and apparatus for a vehicle shock absorber comprising a main damper cylinder, a first reservoir and a second reservoir. Having at least one programmed threshold voltage in the erase voltage domain reduces the Vread voltage level to minimize read disturb effects, while extending the life span of the multi-level Flash cells as the threshold voltage distance between programmed states is maximized. The coil has a front end and a rear end. The thread of one threaded section corresponds to the thread of one connecting piece, and the thread of the other threaded section corresponds to the thread of the other connecting piece. Illumination light L2 introduced into the guide plate escapes gradually from the back face and the illumination output face on the way of propagation.