A voltage adapter characterized by an advantage of reducing unnecessary power loss induced in standby mode operation and conserving the overall power consumption accordingly. The actuator assembly includes an upper casing, a lower casing secured to the upper casing, and a diaphragm assembly disposed between the upper and lower casings. The three ports are positioned relative to the wavelength selective filter. The child seat has its own belt system for securing a child sitting on the child seat. In use, the footrest is pulled out of the main frame and the chair is moved and unfolded.