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Resetting the bedroom clock twice a year, and again after every power cut, is a small chore that never gets less annoying. Atomic clocks, which are properly called radio-controlled clocks, solve it by listening for a time signal broadcast by a government station and adjusting themselves. In North America, that signal comes from a transmitter in Colorado. If you are shopping for the best atomic radio alarm clocks, you are really shopping for a clock that you set once and then forget.
This guide is for people who dislike manual setup, for households with several clocks that drift apart, and for anyone who wants the right time at the first glance each morning. We looked at four models from La Crosse Technology and Oregon Scientific, covering digital, analog and projection styles. We explain what the makers list, where reception can be a problem, and how to place a clock so the signal has the best chance to arrive.
Quick Comparison
| Product | Best for | Main point | Link |
|---|---|---|---|
| La Crosse 617-1485B | A bright digital bedside clock | Multi-color display with automatic daylight saving changes | Check on Amazon |
| La Crosse 617-249 | A curved LED clock | Atomic time with a USB port | Check on Amazon |
| La Crosse 617-710B | Fans of an analog face | Atomic analog alarm clock with hands | Check on Amazon |
| Oregon Scientific RM338PX | Reading the time on the ceiling | Radio-controlled projection clock with dual alarm | Check on Amazon |
How These Options Were Chosen
We compiled this list from manufacturer pages, retailer listings and published manuals, and we have not run these clocks in our own homes. We kept only clocks that state automatic time setting from a radio signal, that carry a named brand and a clear model code, and that include a working alarm. The category is smaller than ordinary digital clocks, so four models were enough to give a real spread of styles. Signal strength depends on where you live and how your house is built, which is why we spend a section on placement below.
The Best Atomic Radio Alarm Clocks
La Crosse Technology Atomic Color LED Alarm Clock with Temperature 617-1485B
Retail pages describe the 617-1485B as an atomic alarm clock with a multi-color display, an indoor temperature reading, snooze and a USB charging port. The maker lists automatic daylight saving resets, which means the clock moves its hands, or in this case its digits, at the right moment in spring and autumn without you touching it. An earlier version, the 617-1485R, is shown as retired, so this is the current listing to look for.
What sets it apart is the reading experience. The digits are big, you can choose a color, and the whole thing is easy to understand at a glance. It suits someone who wants the time to be right with no attention paid to it, in a bedroom or a home office.
The limits are those of any radio-controlled clock. Reception depends on the location, and a clock in a concrete building or near electronics can struggle to lock on. The glowing display is not for everyone, so look at the brightness options. Skip it if you want an analog dial or if you live far from the transmitter and your house blocks radio waves.
La Crosse Technology Atomic Curve LED Alarm Clock with USB Charging Port 617-249
The 617-249 puts the same idea in a curved case. Its listing names it an Atomic Curve LED alarm clock with a USB charging port, so you get automatic time, a bright readout and a place to plug in a phone cable. It is a straightforward product for people who want fewer decisions.
It suits a nightstand where the clock is viewed from an angle, since the curved front gives a different viewing angle than a flat one. Combined with automatic time, it is a good gift for a relative who does not want to learn menus. The port adds convenience without making the clock more complicated.
It has no radio broadcast tuner and no speaker, and the choice of looks is narrower than with the 617-1485B. As with others in the group, the first time you set it up, give it a night in a spot near a window so the signal can arrive. Skip it if you want a color display or a clock with a temperature readout.
La Crosse Technology Atomic Analog Alarm Clock 617-710B
The 617-710B is for people who think a clock should have hands. La Crosse lists it as an atomic analog alarm clock, which means the sweep of the second hand and the traditional dial come with automatic time correction. It suits a person who finds a digital glow harsh at night, and it is a calm, familiar object on a shelf.
An analog design works well in a room where a lit display would be a distraction. The correction happens quietly, so you keep the look of a classic clock without ever setting it by hand. It also pairs well with older furniture and traditional decor.
The trade-off is readability in the dark, which depends on the dial markings and any light feature, so check the listing. Analog alarms can also be gentler than digital ones, which some people like and others dislike. Skip it if you need a USB port, a bright digital face or a big readout for tired eyes.
Oregon Scientific Proji Projection Clock RM338PX
The Proji adds radio control to projection. The manual describes a radio-controlled clock that receives signal data, a dual alarm, a thermometer, and a projection that can turn up to 180 degrees. That means the clock sets itself and then puts the time on the wall or ceiling.
It is the pick for a person who wants projection and automatic time together. The thermometer is a small bonus, and the dual alarm helps a couple. It can run on batteries as well, so it may sit in places that a plug would not reach.
Some versions are shown as discontinued by retailers, so confirm availability and the exact suffix of the code. A reviewer says it lacks station presets, which is not surprising, since it has no broadcast tuner. Reception of the time signal depends on region. Skip it if you want a radio, or a large display that does not rely on a ceiling.
Best Self Adjusting Alarm Clock for Daylight Saving
The La Crosse 617-1485B is the one that lists automatic daylight saving resets plainly. If the twice-yearly change is your main reason for buying, look there first, and confirm on the page that your time zone is supported.
Best for People Who Hate Setup Menus
The 617-249 is simple, and the analog 617-710B has even fewer settings to worry about. In both cases, you plug in or add batteries, give the clock time to find the signal, and move on.
Best for a Dark Bedroom
An analog face avoids the glow of an LED, so the 617-710B suits a room that must stay dark. If you want the time without a bright display, the Proji’s projection can also be dimmed, according to the manual.
Best for Reading Time From Bed
For checking the time without moving, the Proji projects the hour onto the ceiling. Atomic accuracy plus projection means you read a correct time from your pillow.
How to Choose
The most important question is reception. These clocks rely on a signal that travels by radio, and the signal can be weaker in steel-framed buildings, basements and areas close to large electrical equipment. Check how far you live from the transmitter and read what the maker says about range. Many owners place the clock near a window for the first night.
Next, think about display style. LED clocks are bright, analog clocks are subdued, and projection clocks move the display to the ceiling. Match the style to how dark you want your bedroom to be, and look at dimming options.
Check how the clock handles daylight saving. Some models change the time automatically for the zone you select, while others need you to set the zone at the beginning. Look at the zone switch and read the instructions. In regions that do not use daylight saving, confirm that the feature can be turned off.
Look at alarm features as well: single or dual, snooze length and the alarm tone. Think about power, too. A wall plug and a battery backup keep the time stable, and battery-only clocks need a regular change of cells.
The common mistakes are placing the clock beside a router or a television, which can interfere with the signal, and expecting immediate results. Some units take hours to lock onto the signal, and the best time is usually at night, when the signal is stronger.
A last practical point is what you give up compared with an ordinary quartz clock. A radio-controlled clock costs a little more attention on day one, since you must wait for the first sync, and the signal-seeking routine may use battery power on models that rely on cells. In return, you get a clock that corrects slow drift and stays in line with every other atomic clock in the house.
Installation, Safety and Legal Notes
Follow the maker’s instructions for batteries, power and placement. Keep the clock away from water and heat, and use only the adapter supplied. Do not open the case. If you want outlets installed near the bed, call a licensed electrician. Radio-controlled clocks only receive a signal and do not transmit, so there are no special permits, but if you live outside the area covered by the signal, check whether the clock supports your region.
Care and Troubleshooting
| Problem | What to try |
|---|---|
| Time does not update | Move the clock near a window, away from electronics, and wait overnight |
| Time is one hour off | Check the time zone and daylight saving switch |
| Display is dim | Check the adapter and the brightness setting |
| Analog hands drift | Replace batteries and force a new signal search |
When a clock seems to ignore the signal for days, work through the basics before giving up: fresh batteries if it uses them, a different wall of the room, and distance from routers, televisions, chargers and fluorescent lamps. Write down the model code in case you need the maker’s support page. Dust the case with a dry cloth. If you move the clock to a new room, give it a fresh night to look for the signal.
Frequently Asked Questions
What does atomic mean on an alarm clock?
It means the clock receives a time signal derived from an atomic clock and adjusts itself. The clock itself has no atom inside.
Does it need Wi-Fi?
No. It uses a radio signal, not a network.
Why will it not sync in my home?
Walls, metal and electronics can block the signal. Try a window or a different room.
Will it work outside the United States?
Signals differ by region. Check that your model supports the one in your area.
Can I still set the time by hand?
Most models allow manual setting if reception fails. Read the manual.
How long does the first sync take?
It varies by model and by signal strength. Many clocks search for several minutes, and some wait for the night hours, so leave the clock alone for a day before judging it.
Can I use an atomic clock in a basement bedroom?
Reception is harder below ground. Try placing the clock near a window or an upper floor for the first sync, then move it, or set the time by hand if the maker allows that.
Does the alarm also set itself?
The time is automatic, but you still set the alarm time you want.
Bottom Line
For a bright, feature-rich clock, the La Crosse 617-1485B stands out. The 617-249 is the simple LED choice, the 617-710B suits fans of dials, and the Oregon Scientific Proji works for ceiling readers. Choose by display style, place the clock near a window for its first night, and follow the maker’s guidance.