Under the protective plexiglass cover, each device features 13 LEDs. Each pixel has a ridged plastic cover to direct the light up toward the window rather than back into the room. Greg Steinbrecher—The Tech May. 9, 2016 Facebook Twitter Reddit Print Under the protective plexiglass cover, each device features 13 LEDs. Each pixel has a ridged plastic cover to direct the light up toward the window rather than back into the room. Greg Steinbrecher—The Tech