1:Time and temperature display automatically and recurrently; With sound sleep wake-up function and display brightness automatically reduced by half in the evening from 6:00 to 7:00am, helpful for energy saving. 2:Built-in clock backup power source (coin cell), when external power is off, it will continue to calculate time, but it does not display and alarm. Two power modes, USB or 3 x AA batteries for power supply. 3:When the alarm sound lasts for one minute, it will give out "Dididi", in alarm mode, press any button can stop the alarm. 4:With 3 buttons: SET / UP / DOWN, easy to operate. 5:Temperature display in convertible unit Celsius / Fahrenheit. When in 12/24 hour clock, 12/24 hours can be converted. The default is 24-hour system. It can be set to always display time (May be set to display time, date, temperature alternately). 6:Voice feature: When in the power saving mode, pat palm or make a corresponding sound to wake the display.