This temp humidity monitor provides the latest Max/Min data starting from 00:00, it will refresh after 24:00. So you could be well prepared to any changes to your home living evironment.

It is strongly suggested to keep it plugged in so you could select the brightness of the display from Dim, Medium and Bright. If there is no electric power connect to it, it is powered by AAA batteries. The display will auto dim then. Touch the top to light up the display for 15s.

This temp humidity monitor could also be powered by batteries. It could be a better choice if you use it in a baby or kids room, or use it in your bedroom if you are very sensitive to light. The display will be totally dark so will not influence your sleep.