: Gently lift the plastic module out of the case. Be careful not to press the side buttons while doing this.
It eliminates internal reflections, making the screen legible from extreme angles, even underwater. It also theoretically improves the watch's depth rating by making it incompressible. YouTube casio w-800h mod
: Before reassembling, use tweezers to short the point marked "AC" and the positive side of the battery for two seconds. This "reboots" the software to recognize the newly enabled feature. YouTube : Gently lift the plastic module out of the case
(specifically a small Phillips head). Soldering Iron with a fine tip (or a sharp craft knife). It also theoretically improves the watch's depth rating
The most popular modification for the W-800H is enabling the hidden countdown timer. The watch uses the same internal module as more expensive Casio models but has a specific solder bridge on the PCB that "tells" the software to hide the timer function.