Powered by 4 pcs AA alkaline batteries (Duracell brand) can keep the big 1.2'' LED time display more than 1 year 12/24 hour display,one 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 automatically about 10 pecent during 8pm~6am. The flashing of dots between numbers can be shut off per your needs.Has wall-mount hole for easy haning Cordless and portable,Great idea for traveling,trailer caravan,motor home,cruise boat tent cabin hunting lodge, portaable cordless don't need plug in a outlet to keep work.