The AcuRite Atomic Dual Alarm Clock features an illuminated color display with outdoor and indoor temperature, atomic clock and calendar and two alarms. Offers the convenience of USB charging for compatible smartphones. The dual, programmable alarms can be set for everyday use, weekdays or weekends only. Atomic clock is radio-controlled to synchronize to the correct time broadcast by the National Institute of Standards and Technology (NIST) Radio Station, WWVB, for split-second precision accuracy. The clock automatically adjusts itself for Daylight Saving Time (DST). The outdoor sensor features powerful wireless technology, weather-resistant construction and an integrated hanger for easy mounting. One-year limited warranty. It"s more than accurate, it"s AcuRite.