Gigibon GG-HTC2 Travle Alarm Clock and Digital Hygrometer Temperature Humidity Monitor, Large LED Display, Battery Operated with Indoor and Outdoor Temperature, White Multifunctional digital clock, with humidity and temperature monitor Atomic clock, light weight, but large digit display--- it is one travel clock, a desktop temperature monitor and a humidity gauge Battery-operated LED clock, energy-saving device--- the LED clock is powered by one AAA battery (included), which is able to make it run for 1 month Optional display--- 12 or 24 hour time display, Fahrenheit or Celsius display, completely up to you