Energy saving, environmental protection,no sound generated, it is entirely led lights up, one LED on each dot, the light is very soft, and the brightness can be dimmable , no heat generated, the power consumption is less than 1.5 kWh per month. There is no radiation. LCD clock face will be not clear in the light, LCD clock must be back against the light, LCD clock is completely non-existent such problem, why some clocks can be so cheap Since it is to LCD display clock, LCD screen clock can NOT be seen clear when the light too shine or too dark. Light function: at night, it works as light, as the brightness of lighting can be adjusted.Then this clock can work as little night light and it can be read in a long distance which is very different from the traditional digital clock which just can be read in a short distance. In daylight, it is also can be readable in a very long distance. Functions: Time display: Hour/min/sec display. Calendar: Available to switch to calendar display. Temperature display: Available to switch to Temperature display. Alarm: with alarm function and you can set the time interval between each alarming as you like from 1minutes to 60minutes. The ringtone grows from lower to louder, and slower to faster. Long-distance readable. it is readable easily within 25 meters, which is very very big different from traditional clocks with a short-distance reading only. It just cost about 1.5kwh per year only. Lot lot lot of energy saving! Mirror surface: its surface looks like a mirror when the power is off, it almost likes a cell phone surface effect. Specification: Products Size: 242 85 56mm/9.5 3.3 2.2inch Power Supply: AC/DC adapter, transformer supports: 100-240V,50/60Hz. Package Include: 1 x Digital Large Big Jumbo LED Clock