AcuRite 13024 Atomic Dual Alarm Clock with USB Charging Atomic Clock features split-second accuracy and automatically adjusts for DST Monitor indoor temperature right from your nightstand Set 2 separate alarms for daily, weekday, or weekend use USB power port charges your cell phone while you sleep, AC adapter-powered with battery backup in case of power loss. Kindly refer the user manual given below for troubleshooting steps.