Needs a AAA 1.5V battery (not included in the product). The screen shows hygrothermograph and clock. Celsius and Fehrenheit could be changed delibrately, and the highest temperature and the lowest temperature memory function. The clock has 12- hour mode and 24-hour mode, and hour time signal, alarm clock, and calendar display function.

Button function: MODE: Change the clock and alarm clock display mode/ set time, alarm, 12 or 24-hour mode, date.

ADJ: Set the number of the mode

MEMORY: shows or clear the highest or lowest tempreture in the memory.

The product could be put with the frame or on the wall. There is a black button under the frame to change the celsius and fehrenheit.