What is the purpose of the rotating bezel on the Callaway CY2058? It has no markings, which it needs to be useful.

Question edited for clarity 'call away' to 'Callaway'.
Question moved from Television to Callaway Watch.

https://www.google.com/search?q=callaway+golf+watch+blank+screen

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It is a numbered ring surrounding the crystal [ glass ] which should be rotatable to bring the numbers to where you need them for various purposes....it has a spring loaded detent [ click! ] for each position....but , be warned,......some are fake ,decorative only, & dont work........jimbanjo

The rotating bezel can be used to measure elapsed time. For example, if the time on your watch reads 10.10, align the zero point of the bezel with the minute hand. Now, say the time is 10.40, the minute hand at 8 o'clock will point towards 30 on the bezel, indicating that 30 minutes of time has elapsed since 10.10.

some watches have a notch that comes out where you can get a knife, or exacto blade underneath to pop it open. if not, there may be multiple intends along the ridge that would require a special tool to twist open. any jewler could change the battery for you. also, batteries plus stores can change the battery out at a reasonable price.

This watch is water-resistant to 5ATM (atmospheres), which means that you have to use a machine or a special tool to reseal the back of it to keep it water-resistant. If you do manage to get the back off, you'd probably end up cracking the crystal when you try to put the back on after replacing the battery.
I would suggest taking it to a locally-owned jewelry shop-- shouldn't cost more than $5-10, which isn't bad for a watch that probably cost you almost $100.

hi, just noticed your question, i deal in american stock, and have at this moment the exact watch. brand new in black metal tin, ( the tin does have couple of scuff marks on it) watch immaculate brand new. ring me on 07785 323161 steve

Here you go:
http://ww2.tagheuer.com/_documents/manuals/EI2247_en.pdf

Best regards.Jewel

mcdevito75 here, I"m pretty sure the mechanism is called a Ratchet mechanism, most likely for all watches with rotateing Bezels.

If the stem is pushed in, then it needs a battery. A watch will stop if the stem is pulled out. Have the jeweler check the battery in it first and if the battery is good, then you were sold a lemon.

It is primarily cosmetic - the bezel was originally designed for diving, military activities or similar where counting down time was critical. Before digital stopwatches etc were built into watches as a feature, what you did as a diver was turn the bezel to the time (say 30 minutes) of air you had left, then the minute hand would travel around the face to the position 0 on the bezel, telling you 30 minutes had passed. You often find compass directions, various job specific calculators etc on bezels also, but unless you need a stopwatch / time reminder and don't have that feature in the watch itself, then it is purely a tradition to include a rotating bezel. The original bezels would have the time markings going the opposite way to the watch face usually, however on many modern watches, they often go the same way, allowing you to see how much time has passed, rather than how much you have left. Hope this clears things up :)