Battery Powered ClockThis digital clock is powered by only 2 AA alkaline batteries (not included), you No need to press a button to see night time. 12 or 24 hour time format. Bright LED Time Display24 hours bright 1.2 inch large LED hour numbers allow you to read the time clearly remotely, even in the dark without any operation. (Note: Cannot be placed in a very bright place, otherwise the display will become blurred.) Daily Alarm Clock & High PrecisionThe alarm clock works for 90 seconds, wakes you up permanently. The alarm tone becomes louder every 30 seconds. The time accuracy of this watch is +/- 30 seconds per month. Desk and Wall ClockGreat for kids, teens, adults, seniors and seniors, simple nightstand gift alarm clock. Portable alarm clock with warranty