Wake up to the time or temperature projected in large digits on your wall or ceiling with the AcuRite Projection Alarm Clock. The clock features an illuminated color display with indoor and outdoor temperature, Intelli-Time clock and calendar, moon phase and alarm settings. Offers the convenience of USB charging with a maximum output of 1000mA (1A) for compatible smartphones. Intelli-Time clock automatically updates itself for Daylight Saving Time. The programmable alarm can be set for everyday use or weekdays only. The outdoor sensor features powerful wireless technology, weather-resistant design and an integrated hanger for easy mounting. Features a wireless (RF) range of up to 330 feet (100 meters). Alarm clock is powered by a 5V power adapter (included; recommended for optimal display color) or 3 AA alkaline batteries (optional; not included). Wireless sensor is powered by 2 AA alkaline or lithium batteries (not included). Lithium batteries recommended for use in outdoor sensor for temperatures below –4 degrees Fahrenheit (-20 degrees Celsius). One-year limited warranty. It's more than accurate, it's AcuRite.