This is the model with the exposed button on the right side. The back does not come off, but the front does! If you use a loop you may be able to see a notch between 7 and 9 O'clock. Be very careful because the gasket keeping the watch water resistant is right there. You do not want to harm it. I put the watch in a holder and place a very thin jewelers screw drive on the side. With a jewels hammer I tap lightly until the front comes off. You must then carefully remove the movement from the case and not touch the hands. In order to close the watch after battery replacement, a watch press is a must. Without the press, you won't get the watch closed. The manufacturer suggests taking the watch to a qualified professional. You can send it to the manufacturer as well and they will change the battery for you. The Manufacturer is La Crosse Technology in La Crosse Wisconsin.
SOURCE: how do I set time on an eh-23sa watch
http://www.lacrossetechnology.com/eh23sa/manual.pdf Hi Bill click link this will explain in detail your question i think you will find it is automatic and sets itself ..but check instructions will tell you hope this helps
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