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There is a Li-battery in the storage battery compartment to track the current time and the current settings, which means the clock can calculate the time accurately even when the clock is not powered, but the screen cannot be light up normally. So whenever the clock is repowered and reactivated, there is no need to reset the time or any other parameters.
Important:Understanding the impact of temperature and humidityKnowing your home’s temperature and humidity level is essential to improving indoor air quality and the overall health and comfort of you and your families. To ensure your home’s air quality, the Environmental Protection Agency (EPA) suggests maintaining proper indoor temperature and relative humidity (RH) levels to reduce the effects of many of unwanted conditions associated with poor indoor air quality.
LDC Display Size 7.2 x 4.6 inch 13 x 5 inch 7.6 x 4.3 inch 6.7 x 3.7 inch About Autoset Using a Li-battery to store the current settings,so there is no need to reset the clock when it is powered back on. Using a Li-battery to store the current settings,so there is no need to reset the clock when it is powered back on. Using radio frequencies broadcast from NIST’s Colorado to self-setting to the correct time everynight. Using radio frequencies broadcast from NIST’s Colorado to self-setting to the correct time everynight. Alarm Clock ✓ ✓ ✓ Backlight No backlight. No backlight. No backlight. No backlight. Power Supply Mode 3 "AA" Batteries.(Included) 4 "AA" Batteries.(Included) 3 "AA" Batteries.(Included) 3 "AA" Batteries.(Included)