La Crosse Technology WT-3144S is an atomic wall clock. It is designed to receive the WWVB atomic time signal from Ft. Collins, Colorado, and automatically set itself to the correct time. The clock also features a DST (daylight saving time) selector, so you can easily adjust for daylight saving time changes.

To use the clock, simply insert an AA battery into the movement and place the clock on a wall that faces Ft. Collins, Colorado. During the night, the clock will set itself. If the clock does not receive the atomic time signal after 8-10 minutes, it will run from 12:00 am. The clock will continue to search for the atomic time signal, and will typically receive it within 5 nights.