La Crosse Technology 617-1485B Atomic Color Alarm Clock with USB Charging Port Atomic self-setting time and date with automatic Daylight saving time reset USB charging port for mobile devices (charge cable not included) Indoor temperature & humidity with trend arrows Adjustable backlight settings Moon phase icons The design of this alarm clock is to use AC power (5-volt) as primary power source. When operating with the AC power cord, the backlight can be on continually