Oregon Scientific RMR602A Dual Alarm Wireless Indoor/Outdoor Thermometer with Self-Setting Atomic Clock and Remote Sensor Indoor/outdoor thermometer with remote, wireless sensor and atomic clock Automatically synchronizes with the US Atomic Clock Wireless sensor monitors and displays outdoor temperature Dual alarm clock settings; wall mount and desktop display options Measures 4 by 4 by 2 inches; can display on wall or desk; runs on 2 AA batteries (not included)