Product Description: Easy to Read LARGE numbers - Easy to Set-up!: Jumbo 4” Tall LCD Time Display - Easy to Read, Easy to Use, Easy to Set up - Use as either a wall clock, or as a desk clock with integrated stand. Perfect for anyplace in your home. Atomic Accuracy - Battery Powered - Use Anywhere!!: Atomic Accuracy: The Atomic clock has a built-in receiver that automatically synchronizes itself with the WWVB radio broadcast by the US Government’s National Institute (NIST) in Fort Collins, Colorado. The Atomic Clock will always be accurate to within one second as it receives daily WWVB updates. Battery powered: Main unit 4 x AA batteries - Sensor 2 x AAA batteries (not included) Indoor & Outdoor Temperature with included Sensor: Easily tell the temperature both inside AND outside! The compatible with Sharp SPC1022 has a built-in sensor to read the indoor temperature at the clock's location and also includes a wireless outdoor sensor that will read the temperature from the comfort of inside your home. The Wireless outdoor sensor (included) transmits the outdoor temperature to the Atomic Wall Clock. The sensor can be placed anywhere within 100ft of the receiving unit. The wireless technology means no wire installation is necessary. Note: The wireless sensor is included in the box, separate from the clock. All Controls are on back of clock for Simple Sleek Style: All controls and battery compartment are located on back of clock to give the SPC1022 a sleek, stylish appearance that will fit into any decor in your home, office, classroom, garage - anywhere you need a clock! The clock has built in hanging holes for easy wall placement (and since it is battery operated - no cords to show), or, you can use the built-in back stand that allows you to stand the clock on a shelf, counter, or any flat surface. compatible with SHARP - A Name You Can Trust.: compatible with Sharp has been making quality clocks for over 25 years and is the largest supplier of Retail Alarm Clocks in the United States with over 61,000,000 sold. Millions trust us with their time needs for their day and staying on track. Atomic Accuracy: The Atomic clock has a built-in receiver that automatically synchronizes itself with the WWVB radio broadcast by the US Government’s National Institute (NIST) in Fort Collins, Colorado. The Atomic Clock will always be accurate to within one second as it receives daily WWVB updates. Jumbo 4” Tall LCD Time Display - Easy to Read, Easy to Use, Easy to Set up - Use as either a wall clock, or as a desk clock with integrated stand. Perfect for anyplace in your home. Displays time (hours, minutes, seconds), indoor and outdoor temperature, calendar and day of week Battery powered: Main unit 4 x AA batteries - Sensor 2 x AAA batteries (not included) Wireless Outdoor Sensor: The Wireless outdoor sensor (included) transmits the outdoor temperature to the Atomic Wall Clock. The sensor can be placed anywhere within 100ft of the receiving unit. The wireless technology means no wire installation is necessary. Note: The wireless sensor is included in the box, separate from the clock.