Hi, have an Ohsen WR30m watch, no manual...can you advise how to turn off the alarm (a single beep) that goes off on the hour?

Question edited for a little more clarity.

This is one of those watched with multiple dials and dozens of functions. It sounds like there is an hourly repeating alarm at 10 minutes to the hour. All time zones are synchronised to the top of the hour. The best thing to do is remove the batteries for 2 minutes and replace them. Then set the time again.

https://www.google.com/search?q=Casio+AE-1200whb-3bvdf+watch+manual

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Question edited for clarity

Video here and there is a manual on Scribd.

https://www.google.com/search?q=mingrui+wr30m+watch+manual+pdf

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Easiest way is to take watch to a watch repair, jewelry store, or big box store like Walmart. They can sell you that battery and install it for you.
To determine the battery type, you will need to refer to your manual, or you can try looking on the back of your watch (which sometimes lists the battery type.)

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Ohsen watch manuales instruction description:

A Key = Light

B Key = Mode

C Key = Start

D Key = Reset



In normal time to show, press the button to enter B mode, click Settings when choosing D Key respectively, minutes and seconds, C key to adjust.

Hours, minutes, seconds, month, day, week;

12/24 hour clock selection



* Daily Alarm Clock

Daily alarm only " Hours" and " Minutes" to choose

The whole point timekeeping



* Running Seconds

From 0.04 seconds start running time;

The Longest 23 hours 59 minutes 59 seconds



* EL black light

Any mode, press the A light EL backlight for 3 seconds



* Use 3V batteries



Running Second Mode:

Press B button click into the race second mode, press the C key to start timing, the timing of the state, press the D key to pause time;

At the time of state, then C key, stop the clock, press the D key to this state would be zero time.

Press B button to return to normal time mode;



Alarm setting mode:

Regular time mode, press the B button 2 times into the alarm set;

Press C key to the "alarm" whole point of time" to set " open" and "off";

Press D key to adjust the hours, minutes;

Press C button to adjust the number of selected;

Press B tutton to return to normal time statues.

At the same time in any state, this button will issue a Bi Bi sound;



Time, date setting mode:

In normal working mode, press the B button 3 times to see the second in the flashing, then press the C key, " seconds" will be zero;

Press D key to select each "Hour" " Minute" " Day" " Week" set;

Press C key, you can adjust the number;

Press B button to return to normal time status;



12/24 hours;

Under normal travel time; Press B button 3 times to enter time setting mode, then second in the flashing, second place in the transferred into " H" when the table show has been converted to 24 hours system; when the position becomes"O" on the afternoon of adjustments; seconds into "R" for morning; "P" for PM.

In time mode, hold set (bottom right button) to change date and time. The selected (flashing) item can be changed in one direction only using the up (top right) button. Press set again to cycle through each item until desired settings are chosen.
In stop watch mode, the up button starts and stops the stopwatch, the set button will take a split time while the time is running. To reset the stopwatch, press set once while the time is stopped.
In alarm mode, the up button turns the alarm on and off. There are three alarms available. To cycle though alarm times, press set. To set an alarm, press and hold set until the time flashes, then set the alarm time using the up button, cycle through hour and minutes using the set button. When finished, press set again.
Timer mode. To set the timer time, press and hold set until the time flashes. The timer goes up to 23h:59m:00s. You cannot set seconds. Once set, the timer can be started and stopped using the up button. There is no reset for the timer, to start a new timer the time must be manual changed again.
To check heart rate, press and hold mode until PUL is shown, place two fingers, one each on the top and bottom metal contacts for 6-10 seconds to get reading (This works best when not in motion).

Dave, you're amazing!

Watch manual doesn't show this secret trick. Bought $5 watch now in 2017, and held down C while pressing A and weekdays on/off toggles the beep.

to turn off hourly chime on the times wr 30m, simply press (in any mode, i just use the regular clock mode) the start/stop button (top right hand button) once (for about half a second).
  if you don't hear anything, you've turned off the hourly chime!  if you hear two short beeps, you've turned on the hourly chime.    turning the chime off/on is cyclic.  if you press once and hear nothing, it's off.  if you press again, you'll hear two beeps and the hourly chime is now on.    a lot of times that button hits my wrist (i wear it on my left hand) by accident, and that's how the chime turns on and off.  i hope this helps someone.

To turn off the hourly beep: While holding the lap/reset button down, press the mode button. When all 7 day flags show, the hourly chime is on. When no day flags show, the chime is off.