Powered by 4 pcs AA alkaline batteries can keep the big 1.2'' LED time display more than 1 year 12/24 hour display,one very loud daily alarm can be set and snooze alarm is available.Touch to stop alarm Bright LED time can be see at day and night and clock will dim about 10% automatically during 8pm~6am. （Note:The clock should not be put in a very bright place, or the display will be fuzzy and the numbers difficult to read.) The flashing of dots between numbers can be shut off per your needs.Has wall-mount hole for easy haning Great idea for traveling,trailer caravan,motor home,cruise boat tent cabin hunting lodge, portable and cordless don't need plug in a outlet to keep work.