Feature: 1. Easy to Read Large Screen: Featuring a bright full color display with 3 adjustable brightness levels. The AC power source keeps the backlight on constantly, with the option to dim or turn off using the backlight button. Battery powered performance offers 5 seconds of backlighting on demand. 2. Atomic Accuracy: The atomic clock displays time in 12 or 24 hour format. Equipped with a built in atomic clock, this weather forecast clock has a receiver that automatically synchronizes with radio broadcasts from the National Institute of Standards and Technology (NIST) in Colorado's Fort Collins. The atomic clock ensures accuracy down to the second. 3. Indoor and Outdoor Temperature Humidity Display: Easily view current indoor and outdoor temperature and humidity on the full color display. The main unit features an internal temperature and humidity sensor, while the outdoor wireless sensor (included) transmits outdoor temperature and humidity data. The wireless sensor can be placed within 100 feet of the receiving unit and requires 2 AAA batteries (not included). 4. Full Color Weather Forecast Display: Displaying 12 hour weather forecasts and trends with 6 weather icons in full color, indicating clear sky, partly cloudy, rain, thunderstorms, and snow. 5. Backlit On Demand Battery Power: The weather clock has a USB plug. Compatible with USB outlets, the weather clock can be powered for always on display. It can also operate in optional battery mode (main unit requires 3 AAA batteries, sensor requires 2 AAA batteries, not included). In battery mode, the backlight button illuminates the screen for 5 seconds. Specification: Item Type: Weather Clock Material: ABS Main Unit Battery: Approx. 3 x AAA Batteries (not included) Sensor Battery: Approx. 2 x AAA Batteries (not included) Weight: Approx. 454.00g / 16.01oz . Package List: 1 x Main Unit 1 x User Manual 1 x USB Cable 1 x Sensor