La Crosse Technology 513-149 Indoor/Outdoor Thermometer & Atomic Clock • Wireless indoor/outdoor temperature with trend arrow;• Automatically updates for Daylight Saving Time;• Low-battery icon for clock & sensor;• Indoor temperature range: 32deg F-122deg F;• Outdoor temperature range: -4deg F-140deg F ;• Requires 2 AA alkaline batteries for receiver & 2 AA alkaline batteries for sensor;