Honeywell RTHL2310 series

Battery replacement
Install two fresh AAA batteries when Lo Batt flashes on the screen. Lo Batt appears for 60 days before the
batteries are depleted.
Replace batteries once a year, or when you will be away for more than a month.
Most settings are stored in non-volatile (permanent) memory. Only the clock and the day must be set after you
replace the batteries.