The Slime Line Personal Weather Station with Atomic Clock from Meade auto-syncs with the US Atomic clock and delivers accurate outdoor and indoor temperature and humidity readings. You can upgrade to up to 3 total remote sensors (one is included) for maximum monitoring capability. The Meade Weather Station with Atomic Clock #TE256W features alarm and snooze with a modern look that is attractive in your home or office. It is the ideal weather station to know the conditions of your home and the outdoors. - - Indoor/Outdoor temperature and humidity -Min/Max memory for in/out temperature and humidity -Monitors temperature and humidity from up to 3 remotes -Outdoor temperature range (lithium batteries): -40.0deg. F to 122.0deg. F (-40.0deg. C to +50.0deg. C) -Indoor/outdoor humidity range 25% to 90% -Comfort level indicators -One remote sensor (TS13C) included operating range to 145 feet (45 meters) -Automatically sets to the U.S. Atomic clock -12 or 24 hour time format -Choose English, German, French, Italian or Spanish -Main unit, large LCD display -Wall mount or desktop option -2-CR2032 (main unit) - included -2-AA (remote sensor) - not included - TE256W