Upgraded Hybrid LED/LCD Display - The illuminated Hybrid LED /LCD display can be read easily even in sunlight and from a distance in the evening. Can be powered by a variety of power supplies - This digital clock can be powered by 2 or 4 alkaline batteries only ( recommended ) or plug-in or both. 4 AA alkaline batteries only can keep the LED time display for over 1 year. (Adapter and Batteries are Not Included) Battery backup function - Batteries ( Not Included) can act as backup power in case of a power outage when powered by both outlet and batteries. Multi Mounting Type - The cordless portable digital clock with a wall mounting hole. It can be mounted on the wall or placed on the tabletops. ( NOTE: The clock is not suitable for plug in when mounted on wall ) Multi-function - With 7 minutes snooze function. 12/24-hour time format, 2 levels brightness adjustable and auto-dim Night Mode. alarm