MARATHON Slim Jumbo Atomic Wall Clock, Walnut Finish - Large, 15-Inch Display - Alarm, AM/PM or 24-Hour Time, Eight Time Zones, Indoor Temperature & Humidity - Four AA Batteries Included

Inserted batteries and within a couple of hours the clock had set itself to the proper time zone and time.Easly to see anywhere in the room.

If instructions followed, it's an amazing clock that keeps accurate time. Enjoy the size of the display.

Received on 9/15/17Had to test this clock for a while and sure enough set itself!But last night had a fan on all night, about 3ft. below clock!As I am quite familiar with reception issues with these Atomic clocksI new that it most likely would not set itself.Other clocks I have show the receive indicator for a few days before it turns off after no signal for that time period.As I had wanted, the signal indicator was off with DST and on when it received an update.That way you know that it was not updated! If I want to improve reception the fanwill be off.I can not really see a need for any larger time digits than these...they are big!If you need a super large display you could use a computer with or tablet w/app and MHL/HDMI connected input. Do they make a 100 foot screen?All that sillyness, anyway, the humidity seems to show 3% high... or my other humidity gauges are 3% low!Not that I will need to use the alarm...it is loud! Can they not put a volume control in!I have modified many clocks to reduce the level! Some I never even use the alarm after but it is less noisy when setting up! Not a big issue w/this one!Temp reading is close to my other devices!Can't speak for battery life. I think MARATHON claims about 8 months.Oh! One last thing! This was used - very good condition item!Could not find anything wrong...it is indeed in very good condition!It was shipped in another box and packaged well!Would buy another for that price! Only $20.00Now where is my 6 volt AC adapter...have to try a USB 5 volt...that might work too!GREAT CLOCK! THANKS MARATHON and AMAZON6/24/18 just an update still working great...and it does update almost everyday even w/fan on. LOVE IT!9/30/19 Update just checked and found that the the batteries were replace on 9/15/2018!Still do not use the alarm but looks like good battery life. If I modifiy and use an AC adapter I guess I wouldnot have to replace batteries in maybe 5 or 10 years! That would be Super!LOVE THIS CLOCK MARATHON!Note: This review has been edit again to make more sense. Best of luck everyone!!!3/06/2023 Happened to find this old review and had to add more.Good battery life so never DYI to AC power yet.The clock had been running a little fast if no update. So I modified and added a trimmer capacitor. Was able to get excellent accuracy over time and adjustment. Great because I moved and the location in the living room is terrible for receiving any updates on any device.DST this weekend so may have to set myself.Still working great!!!Just ordered a similar clock on Amazon but that has temp and humidity for both inside and outside. Hope that works just as good. Will review it soon!!! Thanks again AMAZON!

I took some photos to try to show actual contrast at various angles, because as usual, the official product photos might be optimistic. (My photos are taken against a white painted wall.)In terms of contrast when viewed off-angle, I feel this is about as good as the best LCDs I have seen, such as Casio's LCD wall clocks.Notable positives:- Date display is MM-DD format as delivered, but is easily changed to DD-MM format if so desired.Suggested improvements:- 9-segment numerals like model CL030025 (69.95 USD). (I chose this CL030062 because I want relative humidity display.)- further improve off-angle contrast- Other means of time sync for use in countries that are not served by a radio signal, e.g. Bluetooth Low Energy (BLE) or WiFi. (Model CL800001GH and CL800003 appear to have Bluetooth, but I did not go for them because they lacked relative humidity display, and have some reviews that report bugs.)- better free-run accuracy, or a way for the user to trim the rate.- For use outside the range of the Colorado atomic time radio signal, you CANNOT DISABLE the feature by long pressing the button with the "M" logo. This only stops the current attempt. It will re-attempt every night at 2am, 3am, 4am, 5am!- It has lost 6 seconds in 14 days. i.e. -13s per month.UPDATE on 2018-01-01:PROBLEM: I found this clock somehow transitioned from SUNDAY 31 Dec 2017 to THURSDAY 1 Jan 2082 (and -4 hours).UPDATE on 2018-09-01PROBLEM: It appears that the Radio-Controlled-Clock (RCC) feature might be picking up spurious radio signals at my location (Singapore), which is changing the year to 208x and changing to GMT+4. Marathon has confirmed that the RCC cannot be disabled. Buy at your own risk if using it outside North America.

First of all, I'm really happy with this clock, the function and appearance is what I was looking for... I bought the white one. I do wish it was backlit for nighttime and I wish it was more user-friendly to setup. But if you have patience in trying different things with the buttons if they don't work the way you think they do the first time, then you can figure it out. I would suggest that you first set the time zone by pressing the back left 12/24 button (each time you press it for 3 seconds it will change to a different time zone, (P,M,C,E), keep pressing each time for 3 seconds until you get the right time zone). It was Super helpful to read someone else's review that said it look 48 hrs before the clock synchronized with the NIST's Colorado Atomic Clock. I did try several times with manually scanning for synchronization by pressing the back button on the right side for 3 seconds each time until the signal stopped blinking (when the signal disappeared, it means that the clock is no longer scanning for synchronization with NIST's Colorado Atomic Clock, And when the signal appears on the right hand upper corner of the front of the clock, not blinking anymore and static so you can see it, that is when it has finally synchronized). I read about these types of clocks on Google and how they work. There was a suggestion of hanging the clock high on the wall in order to synchronize better. The first day I manually set the clock with some fiddling with the clock. The second day, I pressed the manual scanning button for 3 seconds and hung it on the wall and the upper right hand signal finally synchronized and I could see that the Marathon logo signal on the upper right hand corner was no longer blinking and was staying on. This made me so happy and makes me love the clock because now that it is sync'd, it's everything I was looking for in a jumbo clock!...Thanks!