A bumper system includes a high-strength metal B-shaped beam with miter-cut end sections, a front center energy absorber, and a pair of energy-absorbing end pieces that nestingly engage front outer ends of the beam. Login authentication is disabled during the computer bootups. The touch panel has a long usable life with the capability of downsizing the whole body, while maintaining a required effective operating area. According to the invention, maintenance and lifespan of the liquid coating device are improved significantly.