Carbon Core Guard structure. Shock Resistant. Watch Features. battery life: 3 years on SR726W X 2. Button operation tone on/off. Double LED light LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow).
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