Honeywell RTH5100B Operating Manual page 2

Battery Holder
Press down and pull to remove
batteries.
Batteries should be replaced once
a year (see page 10).
M28300
NOTE: Remove battery holder; model number is on the battery holder.
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http://DIYthermostats.honeywell.com
or call Honeywell Customer Care toll-free at 1-800-468-1502
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