Smart glass by Packman is private frosted opaque when powered off and transparent clear when powered on.It changes light transmission properties under the application of voltage, light or heat. Smart glass is easily installed on any new or existing glass surface,offering durable privacy on demand, extreme clarity and maximum performance with the click of a button. It can save costs for heating, air-conditioning and lighting and avoid the cost of installing and maintaining motorized light screens or blinds or curtains. Most smart glass blocks ultraviolet light, reducing fabric fading. Smart glass technologies include electro chromic,photo chromic,thermo chromic,suspended particle,micro-blind and liquid crystal devices.It is surely the next generation in switchable privacy glass.