ROYMAX Morning Clock, Built-in Battery Operated Clock with Large Back-lit Numbers, Lasting FOR 3 MONTHS on a Single 12 Hours Charge, USB Cable Included (White) 12 HOURS FULL CHARGING - LASTING FOR 3 MONTHSOperated by Charging Cable and Built-in Rechargeable Battery; 12 Hours Full Charging - Lasting for 3 Months ALARM CLOCK: alarm sounding on time, softly waking you up from dreams. COMFORTABLE VISUAL SENSE TECHNALOGY: smart light; LCD back light turns on automaticaly when the room or circumstance becomes dark, making sure that you can see exactly the time without troubling sleep. SNOOZE FUNCTION: special designed snooze function, when you turn down the alarm, it will ring again 5 minutes later. TEMPERATURE MONITORING: circumstance temperature monitoring function