433-3256A 21" Indoor/Outdoor Atomic Metal Wall Clock
433-3256A 21" Indoor/Outdoor Atomic Metal Wall Clock
433-3256A indoor/outdoor design
433-3256A 21" Indoor/Outdoor Atomic Metal Wall Clock
433-3256A 5 year battery life option
433-3256A Frame and gauge

433-3256A 21" Indoor/Outdoor Atomic Metal Wall Clock

SKU: 433-3256A

Regular price$129.99

433-3256A 21" Indoor/Outdoor Atomic Metal Wall Clock

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  • Automatically Sets the Time
    Syncs with the WWVB Radio Signal to Provide Accurate Time
  • Updates for Daylight Saving Time (On/Off)
  • 4 U.S. Time Zone Choices
    (Pacific, Mountain, Central, Eastern)
  • Learn more about Atomic Time HERE


  • Hammered metal frame
  • Weather resistant UV protected dial and lens
  • Temperature scale (°F/°C)
  • Hygrometer (%RH)
  • Glass lens
  • Metal hands


    • Printed Setup Guide Included
    • Access to U.S. Based Tech Support  · Educational Wall Clock Setup Video
    • 1-Year Warranty
    • 30-Day Money Back Guarantee on LaCrosseTechnology.com Purchases



  • Atomic movement
  • Temperature Range: -40°F to 140°F
  • Humidity Range: 1% to 99% (%RH)

Power Requirements:

  • 1 “AA” Alkaline Battery (Not Included)
  • Extended Battery: 2 Optional “AA” Alkaline Batteries (Not Included) 
  • Battery Life: 12+ Months (1 Battery)
  • Extended Battery Life: 5 Years (3 Batteries)


  • 21" Diameter x 2.75" Deep


La Crosse Technology, Ltd. provides, to the original purchaser, a 1-year limited time warranty on this product, relating to manufacturing defects in materials & workmanship.  In accordance with the Song-Beverly Act, in the state of California, the warranty on this item becomes effective on the date of delivery.  The item will be either repaired or replaced at La Crosse Technology's discretion.

Click Here for full warranty details

Use the registration form below to register ownership of your product only.  If you have a question about use of the unit, please click on the support tab next to this one to see available support material or submit a ticket.


In this video we explain what a clock movement is, go over what "Atomic Time" means, and then demonstrate how to set up and use any of our four main wall clock movements. Use this video to learn how to set up a basic decorative wall clock, or one that uses the WWVB Atomic Radio Signal coming from Fort Collins, CO.

For more information on the NIST or the WWVB signal, visit:

For additional information about you wall clock, visit:


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