AcuRite Intelli-Time Alarm Clock with USB Charger, Indoor Temperature and Humidity (13040CA) Alarm gradually increases in volume over a two-minute timespan to WAKE you peacefully and on-time Integrated USB port (1.5a) charges your compatible smartphone while you sleep Illuminated color display with auto-dimming brightness; electric-powered with optional battery backup in event of power outages Monitor indoor temperature and humidity right from your Nightstand.Intelli-Time clock automatically adjusts for daylight saving time and remembers time settings after power outages or unplugging Time zones:HAST, AKST, NST, PST, MST, CST, EST, AST