435-3256A-C Head on half glow
435-3523A-C Head on
435-3523A-C Head on glow
435-3523A-C Left
435-3523A-C Frame close
435-3253A-C frame close glow
435-3523A-C Lifestyle halfglow
435-3523A-C lifestyle night

435-3256A-C 21-inch In/Outdoor Lighted Constellation Atomic Wall Clock

SKU: 435-3256A-C

Regular price$147.99

435-3256A-C 21-inch In/Outdoor Lighted Constellation Atomic Wall Clock

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  • Atomic Time
  • Weather Resistant
  • Temperature
  • Humidity
  • Lighted Dial



  • Atomic movement
  • Temperature Range: -20°F to 120°F (-28ºC - 48ºC)
  • Humidity Range: 10% 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)
  • 4-D (IEC LR20) for lighted Dial. (not included)


  • 21" Diameter x 3.07" 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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