MARATHON CL030054BK Atomic Humidex Clock with Calendar, Temperature, Heat & Comfort Index - Backlight, Snooze and Loud Alarm. Batteries Included. Black. HEAT & COMFORT INDEX: Choose between a convenient, easy to read comfort or heat index LARGE DISPLAY: The large, highly legible display features the time, day, date, temperature, humidity and either the comfort or heat index BACKLIGHT: Pressing the SNOOZE/LIGHT button triggers an amber backlight ATOMIC: This clock is self setting/adjusting using radio frequencies broadcast from NIST's Colorado Atomic Clock ALARM WITH SNOOZE: Features a progressive alarm with a conveniently placed SNOOZE button for easy access