Black-Out Smartglass offers a complete black-out effect at a flick of a switch. Through the application of a small electrical current, users can immediately transform the surface of these glass partitions from clear to opaque and back again. This transformation from opaque and back can be triggered from a range of wall switches, remote controls, movement sensors, light sensors or timers depending on each customer’s individual needs. There are many benefits of using Smartglass Black-Out : Privacy Black-out Smartglass system has a light transmission system that allows for a complete black-out at a flick of a switch where greater security and protection are required. It can be easily adjusted with a switch, remote control, photocell or any other sensing device. - See more at: http://www.smartglassinternational.com/products/black-smartglass/#sthash.gWyikcyL.dpuf