Sharp

Sharp Atomic Clock Jumbo Display Indoor/Outdoor

4.1 (7248 reviews)

Sharp Atomic Clock automatically syncs to government time broadcasts and displays indoor/outdoor temperatures on a jumbo 3-inch LCD screen.

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Overview

The Sharp Atomic Clock takes the guesswork out of keeping accurate time by syncing directly with the WWVB time signal broadcast by the U.S. government from Fort Collins, Colorado. This ensures the displayed time is accurate to within one second, and the clock automatically adjusts for Daylight Saving Time transitions — no manual setting required after initial setup. The jumbo 3-inch LCD display makes it easy to read the time from across a room, which is especially useful in kitchens, garages, workshops, or any space where you glance at the clock from a distance.

Beyond timekeeping, the clock doubles as a temperature station. It displays the indoor temperature directly on the main unit and receives real-time outdoor readings from the included wireless sensor, which can be placed up to 100 feet away. The clock itself can be wall-mounted or set on a desk using the integrated stand, giving you flexible placement options. It runs entirely on batteries — 3 AA for the clock and 2 AAA for the sensor, none included — so there are no cords to manage, but you will need to keep spare batteries on hand. Note that WWVB signal reception depends on your location and building construction; users in the western U.S. or in steel-framed buildings may experience slower or less reliable syncing.

Key Features

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.

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.

Jumbo 3” 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 or office.

Displays indoor and outdoor temperature - Displays calendar and day of week

Battery powered: Main unit 3 x AA batteries - Sensor 2 x AAA batteries (not included)

Specifications

Accuracy
Atomic (synchronized with WWVB radio broadcast)
Display
Jumbo 3" LCD
Temperature Display
Indoor and Outdoor
Outdoor Sensor
Wireless (100 ft range)
Daylight Saving Time
Automatic adjustment
Power (Main Unit)
3 x AA batteries (not included)
Power (Sensor)
2 x AAA batteries (not included)
Mounting
Wall or Desk (integrated stand)

Pros & Cons

👍 Pros

  • Atomic timekeeping syncs automatically to WWVB broadcasts for accuracy within one second
  • Jumbo 3-inch LCD display is easy to read from across a room
  • Wireless outdoor sensor provides real-time temperature without running cables
  • Automatic Daylight Saving Time adjustment eliminates manual clock changes
  • Dual mounting options with wall mount and integrated desk stand

👎 Cons

  • Requires 5 total batteries (3 AA + 2 AAA) and none are included
  • WWVB signal reception can be unreliable in western states or buildings with heavy shielding
  • 100-foot wireless sensor range may not reach all outdoor placement locations
  • No backlight mentioned, which limits readability in dark rooms
  • Battery-only operation means no AC adapter option for continuous power

Frequently Asked Questions

The clock has a built-in receiver that picks up the WWVB radio signal broadcast by the National Institute of Standards and Technology in Fort Collins, Colorado. It syncs nightly to keep time accurate to within one second.
The wireless sensor has a range of up to 100 feet from the main clock unit, which is sufficient for placing it on a porch, patio, or exterior wall while keeping the clock indoors.
Yes, the clock automatically adjusts for Daylight Saving Time changes based on the atomic signal, so you never need to manually reset it in the spring or fall.
The main clock unit takes 3 AA batteries, and the wireless outdoor sensor takes 2 AAA batteries. Batteries are not included in the box.