Operation Guide 3239/3240: About This Manual | PDF | Backlight
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Sergei Frolov on X: "If you own the CASIO watch 3239 module (W-96H), you can add some handy features (plus 4 daily alarms and coundown timer) by removing or adding jumpers on
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Casio Men's Sport Digital Watch, Black/Orange W96H-4A2V - Walmart.com
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Casio W96H Time and Date Set / Casio 3239 - YouTube
Casio Watch Module Number 3239 3240 Illuminator | eBay