Honeywell RTH6400 Operating Manual page 2

Quick Reference Card
Grasp and pull to see basic
operating instructions at a
glance.
NOTE: Remove battery holder; model number is on the battery holder.
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US Patent No. D542,677 and other patents pending
Copyright © 2008 Honeywell International Inc. All rights reserved.
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Battery Holder
Press down and pull to
remove batteries.
Batteries should be
replaced once a year
(see page 15).
M28400
1-800-468-1502