. By default, the watch only includes a stopwatch, dual time, and alarm. However, because it shares the same internal PCB as other Casio models, you can enable a fully functional 24-hour countdown timer by removing a specific solder jumper. Popular Modifications Countdown Timer Unlock
If you hydromod your watch and then fly on a plane, the liquid expands. Some users report button failure at altitude. If you travel frequently, skip the oil fill.
: This is the most popular mod. By opening the case and using a soldering iron or wick to disconnect a specific jumper pad (usually labeled "J1") on the back of the PCB, you can unlock a hidden countdown timer and up to 5 alarms. Dual Time/Alarm Sound Tweak casio w-800h mod
Are you planning to add a or modify the screen style too? Do you have the necessary tools handy? Share public link
In the world of watch modding, the Casio W-800H is an unlikely hero. For around $20 USD, you get a 100-meter water-resistant, 10-year battery digital watch. But for a growing community of modders, that’s just the starting point. Popular Modifications Countdown Timer Unlock If you hydromod
Here are the most popular mods ranked by difficulty (Easy to Hard).
Fortunately, Casio used the same internal module layout for the W-800H as its more feature-rich siblings. By performing a simple hardware modification, you can unlock a countdown timer and a fifth daily alarm. ⚠️ Technical Risks and Safety Considerations : This is the most popular mod
Take the module out of the watch case. Use your razor blade to carefully peel off the top layer of polarizing film from the glass LCD screen. Go slowly to avoid scratching the glass.
The Casio W-800H is widely regarded as a high-value digital watch, featuring a 10-year battery, 100m water resistance, and a highly legible display. For enthusiasts, this model is a popular candidate for customization, often referred to in the community as a "Casio W-800H mod." These modifications typically fall into two categories: functional electronic adjustments and aesthetic enhancements. Functional Modifications and Technical Risks
For a cleaner, stealthier appearance, you can use acetone (nail polish remover) and a toothpick to carefully remove the white "100m," "Alarm Chrono," and "Dual Time" text from the resin bezel. 3. The "5 Alarm" Modification Method