Londa Blue Backlight Indoor Temperature for Home, Office Black Multifunctional Digital Clock Blue backlight--Large LCD screen (5.12 x 3.15 inch) and big ,bold number display, blue backlight without blinding, gently touch the top SNOOZE/LIGHT button to active blue backlight,push the button, the backlight will be on for 5 seconds, then automatically goes off. Easy to Set Up and This Digital Alarm clock can be freestanding or hung on the wall Digital Wall & Desktop Clocks displays Time Day Temperature Calendar Battery operated portable alarm clock with calendar time date day temperature display ,Great use in bedroom kitchen office children room workshop or on travel Kitchen timer,Indoor temperature range: 0C--50C(32F~122F)