HITO153; 3.9" Simple Alarm Clock- Snooze, grey/soft green/bright blue Numbers Feature NO1: It features a 3.0"x1.5" large display. Time can be read within 33 feet in the day time or 16 feet at night. About light-up: 1, Clock doesn't light up in the day time (see grey numbers in 5th picture). 2, When it's dark around, numbers become soft green, whose brightness is adjustable. 3, If you find green words not easy to read, press SNOOZE/LIGHT?to change numbers into blue. Bright blue lasts a few seconds so as not to disturb sleeping, and then numbers go back to soft green. Feature NO3: snooze repeats every 5 minutes and beeping?alarm sounds from weak to strong. Feature NO4: energy-saving and user-friendly (batteries last about 3 months); QuietCare to ensure a good sleep and best working environment. Feature NO5: Size: 3.9"x2.5"x2.3". Battery Backup: 2 AA batteries (not included)