comments:
McDonnellTech posted on r/watches2w
That appears to be a 2000 Timex Quartz Chronograph. The listings here and here indicate this model has a Miyota caliber 0S10 chronograph movement which uses a standard 395 / SR927SW 1.55V silver oxide battery. The instruction manual is available here. There should be a two-digit date code on the back of the watch that you can find on the table here to determine the month and year yours was manufactured. Hope this helps a bit.