Built in USB charging supports iPhone, Android, eReaders, and most tablets. Dual wake alarm for multiple users. Features: sleep and snooze functions, wake to FM radio or alarm, store and recall radio presets, and battery backup. 1 year limited warranty. Power Source: AC Adapter \nDisplay Size: 0.6" \nDisplay Color: Blue \nBattery Type: 2 AAA \nBatteries Included: No \n