Switchable glass, as its name suggests, is operated by a simple electrical switch, controlling the opacity of the glass from clear to translucent. It can easily be integrated into automation systems too, giving you even more control (Like remote controlling, sensor controlling, Smart devices like Amazon Alexa/Google Do It controlling, Mobile Phone Controlling, etc).
Smart glass or switchable glass (also smart windows or switchable windows in those applications) is a glass or glazing whose light transmission properties are altered when voltage, light, or heat is applied. In general, the glass changes from transparent to translucent and vice versa, changing from letting light pass through to blocking some (or all) wavelengths of light and vice versa.
Smart glass technologies include electrochromic, photochromic, thermochromic, suspended-particle, micro-blind, and polymer-dispersed liquid-crystal devices.
When installed in the envelope of buildings, smart glass creates climate adaptive building shells.