... 2. Aluminum alloy frame 3. With alarm clock setting Indoor 4 inch 4 digit LED Alarm ClockApplication factory, school, mansion, hospital, ... is visible up to a distance of 50 m;Audio Alarm time programmable;Display color options: Red(default), Amber, Blue, Green ... available by buttons on the side of enclosure or by Infrared remote;Energy saving design: LEDs brightness adjustable--high , medium, low ...