At less than four inches square, this exclusive Hilton alarm clock packs a sophisticated array of functions into a diminutive package. The clock has the world's easiest set alarm feature, automatically adjusts for daylight savings time, and maintains alarm setting during power outages. There is also a 'gentle wake' feature that peacefully wakes you with an ascending alarm volume, a multi-function backlit negative LCD display with adjustable brightness and eight levels of display brightness controlled by the snooze button. Please note this model is intended for use within the US and requires a 110V outlet (AC power adaptor included) or 2 AA batteries (also included). 3.78" x 3.07" x 3.39"