How to use the online alarm clock
As you finish your shift at the metro control room and prepare to leave, an alarm for 12:26 am can mark the moment to complete the handover rather than let one final task keep you at the desk. It also leaves a clear reference point before 1:00 am, so the incoming colleague can take over with the necessary details while you gather your things.
A control-room handover may happen amid radio traffic, conversations and equipment noise, so set the alarm volume high enough to stand apart from that background without startling everyone nearby. A familiar tone can disappear into the surrounding sounds; a short test shows whether the signal is actually noticeable from where you are working. If you close this alarm page or allow the device to sleep, the shift handover will receive no audible reminder, so use a separate alarm when you cannot leave both active.
After midnight, the noise around the desk may change unevenly: a quiet spell can make a loud signal excessive, while a sudden radio exchange can mask a softer one. Keep the device within hearing distance and choose a tone unlike the routine alerts used during the shift. At 12:26 am, that contrast is more useful than sheer volume, particularly when your attention is on the final spoken update before leaving.
Common questions
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
What happens if my laptop goes to sleep before 12:26 am?
The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
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