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 3xAA battery for power supply. 3:When the alarm time to sound the alarm one minute to "Didi tick", 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 the time, date, temperature switch display). 6:Voice features: When in the power saving mode, pat palm or make a corresponding sound to wake the display.