Clock time: Display of time, date and week Time display format selection: 12HR&24HR. Date display format selection: M/D&D/M. Two groups of alarm and snooze function (snooze time: 5 minutes) The indoor and outdoor temperature and weather forecast function (7 kinds of weather) can measure the weather after about 12 hours according to the atmospheric pressure and outdoor temperature. The weather conditions can be displayed as follows: sunny, cloudy, overcast, light rain, heavy rain, light snow, heavy snow. Light and projection function: projection display time and indoor and outdoor temperature (indoor and outdoor temperature can be displayed once in 5 seconds) Temperature display unit selection: ℃&℉ Temperature detection range: INDOOR: - 9.9 ℃~+50 ℃&+14 ℉~+122 ℉ OUTDOOR: -40℃ ～ +70℃ & -40℉ ～ +158℉ (5) Cyclic backlight function for color change of 8 colors (DC insertion is effective) Backlight function: DC power supply: high light → medium light → low light → off (recyclable) Battery power supply: bright for 15s, and 8 colors of backlight (white, red, orange, yellow, green, blue, blue, purple) can be selected. Working voltage: battery: 3.0V and DC: 4.5V