Kwanwa Alarm Clock Battery Operated Powered Only with 1.4'' Big Red LED Numbers Display Portable Battery Operated -- battery operated (4X AA alkaline, not included) Ultra-low Power Consumption at least can use for 1 year. No USB cord needed,you can place this LED alarm clock in anyplace you want ,such as desk bedside ..dont need to worry the troublesome AC power or USB cord 24 Hours Light Up Time Display -- The 1.4''Large LED time number will always light up.there are 3 levels of brightness for you choose.the Screen will dim on the Night-mode automatically during 8pm-6am High Accuracy -- Range of accuracy is +/-30 seconds per month),not commended use In bright light Ascending Alarm and Repeat Snooze Function-- Alarm goes off with a gradual crescendo beep for 60 seconds. press "SNOOZE" button, alarm temporarily suspends and will sound again 7 minutes later. MONEY BACK GUARANTEE - Kwanwa clocks have a 90 day money back satisfaction guarantee and 1 year quality warranty.