This slim travel clock is easy to use, it announces the time in a clear male voice and has a large digital display. The clock has a an optional hourly chime and an alarm function with a choice of three alarm sounds. The casing includes a cover which protects the display and buttons and also acts as a stand for the clock. The unit also has a belt clip. Size: 66mm – 2.59″ (W) x 95mm- 3.72″ (L) x 20mm – 0.78″ (D) Powered by 2 x AAA Alkaline batteries (included).