The La Crosse Technology Indoor/Outdoor Thermometer and Atomic Clock is a simple way to monitor the time and temperature. It also includes a time alarm with snooze. It automatically updates for Daylight Saving Time and features a perpetual calendar. The low-battery icon for both the clock and sensor mean this tool will never let you down. The display and TX141V2 wireless outdoor temperature sensor each require 2 AA batteries. Get accurate measurements with the indoor temperature range of 32 deg. F to 151 deg.;122 deg. F and an outdoor temperature range of -4 deg. F to 151 deg.;140 deg. F. Read the wireless indoor/outdoor temperature with the convenient trend arrow.