Honeywell TE219ELW Wireless Indoor/Outdoor Thermometer with Atomic Clock Funky blue backlight displays indoor and outdoor temperatures in low light Programmable ice warning alarm for basement pipes and fragile outdoor plants Large outdoor temp range -40 to 158 F with alkaline batteries Large outdoor temperature range -38 to 158 F with Lithium batteries Measures 11.7 by 11.5 by 2.5 inches; weighs1.2 pounds