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The stock positive LCD is clean, but many prefer a tactical look. Modders either:
The Casio W-800H Go to product viewer dialog for this item. is a favorite among modders because of its hidden potential—specifically, a countdown timer feature that is built into the watch's software but disabled by a physical hardware jumper. 1. The "Hidden" Countdown Timer Mod This is the most popular mod for the
. The watch uses a circuit board shared with other models that have the timer enabled.
The Process: You must open the case and remove the module to access the back of the PCB.
The Hack: Locating a specific solder jumper (often labeled on modding guides as the one to remove) and desoldering it using a soldering iron or carefully scraping it away.
Result: Once reassembled and "reset" (by shorting the AC contact to the battery), a new "TMR" (Timer) mode appears in the menu. Some users have even discovered a hidden auto-repeat function within this modded timer. 2. Aesthetic & Functional Mods Beyond unlocking software features, the is a blank canvas for physical customization: Casio W 800h Mod - Etsy
Modified Casio W800H digital watch: "Nightstone" – duotone violet/turquoise backlight gradient, Timer function unlocked. (9) $156. [mod] Casio W800-H Countdown Timer Modification
Casio W-800H is widely considered a "modder's paradise" because its internal PCB (Printed Circuit Board) often contains the same hardware as more expensive models, with features simply disabled by physical solder connections Core Functional Mods Countdown Timer & 5 Alarms Unlock
: 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
: Some users modify the alarm settings to enable or disable beeps for specific functions like the hourly chime or snooze. Aesthetic & Durability Mods
The Casio W-800H: A Retro Revival with a Modern Twist
The Casio W-800H is a modern reincarnation of the classic Casio F-91W, a watch that has become synonymous with minimalist design and rugged reliability. First released in the late 1980s, the F-91W was a staple of 90s fashion, adorning the wrists of hip-hop legends, tech enthusiasts, and anyone who appreciated a no-frills time-telling device. Fast-forward to the present, and Casio has brought back this iconic design with the W-800H, updating it with modern features while retaining its retro charm.
Design and Features
The Casio W-800H retains the same compact and lightweight design as its predecessor, measuring in at just 36.5mm wide and 9.5mm thick. The watch features a durable resin case with a stainless steel back, ensuring it can withstand the rigors of daily wear. The W-800H also boasts a classic digital display with a date and day of the week function, making it easy to stay on top of your schedule.
Key Features:
The MODding Community
The Casio W-800H has quickly become a favorite among watch enthusiasts and MODders, who appreciate its simplicity and versatility. The MODding community has been instrumental in keeping the spirit of the F-91W alive, with enthusiasts creating custom designs, swapping out straps, and even modifying the watch's internals to create one-of-a-kind timepieces.
Why MOD the Casio W-800H?
So, why has the Casio W-800H become a darling of the MODding community? Here are just a few reasons:
Getting Started with W-800H MODding
If you're interested in trying your hand at W-800H MODding, here are a few tips to get you started:
Conclusion
The Casio W-800H is more than just a retro-style watch – it's a blank canvas waiting for your creative input. Whether you're a seasoned MODder or just looking for a fun and affordable project, the W-800H offers endless possibilities for customization and self-expression. With its durable design, feature-rich functionality, and thriving MODding community, the Casio W-800H is an excellent choice for anyone looking to create a unique and personalized timepiece.
Resources
Share Your W-800H MODs!
Show off your W-800H MODs in the comments below! Share your before-and-after photos, and tell us about your MODding process. Whether you're a seasoned pro or just starting out, we'd love to see your creations!
The most popular modification for the Casio W-800H Go to product viewer dialog for this item.
is unlocking its hidden Countdown Timer feature. This watch uses a universal PCB (Module 3239/3240) shared with other models; Casio disables specific functions on the by bridging "jumpers" on the circuit board with solder. Core Feature: Unlocked Countdown Timer
By removing a specific solder bridge, you can add a fully functional 24-hour countdown timer to the watch's mode cycle. casio w-800h mod
The Mod: Open the case, access the PCB, and use a soldering iron or copper wick to remove the solder from Jumper 0 (located in a specific corner of the board).
Hidden Sub-Feature (Auto-Repeat): Once the timer is unlocked, you can often enable an auto-repeat function. While in timer adjustment mode (numbers blinking), pressing the Light button toggles auto-repeat on or off, though there is no visual indicator on the screen for this. Other Potential Modifications
Beyond the timer, enthusiasts often perform these additional hardware and aesthetic mods:
Casio W-800H Go to product viewer dialog for this item. is one of the most popular "hacker" watches due to its accessible internal module that hides features disabled by the factory. Modifying this watch can transform it from a basic digital timepiece into a high-performance tool with features like a countdown timer and enhanced durability. 1. The "Hidden Feature" Mod (Countdown Timer)
This is the most famous W-800H mod. The watch uses a PCB shared with higher-end models, but certain jumpers are soldered closed to disable features for this specific model. : Unlocks a fully functional countdown timer (including auto-repeat) and potentially enables up to 5 multi-function alarms The Process Open the case back and remove the module.
Locate the specific solder bridge/jumper on the back of the PCB (often labeled near the jumper pads).
Carefully desolder or "scratch off" the specific jumper to open the circuit. Auto-Repeat Feature
: Once the timer is unlocked, you can toggle auto-repeat by pressing the button while in the timer's "Adjust" mode.
Absolutely. The Casio W-800H mod occupies a unique valley in watch collecting. On one side, you have luxury watches that you are afraid to scratch. On the other, you have cheap watches you are ashamed to wear.
The modded W-800H destroys both problems.
You get the rugged, go-anywhere reliability of a Casio digital brain, wrapped in a custom chassis that looks like a million bucks but costs less than a dinner for two. The process of modding—of risking the $20 watch to create a $200 look—teaches you more about watchmaking than just buying a Seiko.
Whether you are installing a simple NATO strap or sawing your bezel to fit a sapphire crystal, the Casio W-800H is waiting for you. It is the perfect gateway drug to watch modding.
Next Step: Go to Amazon, buy the base watch. Order a set of small screwdrivers. Join the r/casiomods subreddit. And remember: If you break it, you are only out the price of a pizza. Press the AC button and try again.
The 10-year battery is ticking. Make every second count. The stock positive LCD is clean, but many
Key Features:
Specifications:
Module Number: The module number for the Casio W-800H is 3417.
User Reviews and Feedback: Users have praised the Casio W-800H for its:
However, some users have noted that:
Availability and Price: The Casio W-800H is widely available online and in-store at various retailers, with prices ranging from around $30 to $50, depending on the region and seller.
Variations and Similar Models: Casio offers various models in the F-Series line, including:
If you're interested in purchasing the Casio W-800H or learning more about its variations, I recommend checking out online marketplaces or visiting a local watch retailer.
Here’s a short, informative piece on the Casio W-800H Mod, written for someone curious about why this budget watch has a cult following among DIY enthusiasts.
When the community talks about a "Casio W-800H mod," they are rarely talking about changing the module. They are talking about three distinct categories: Aesthetics (Voids/Case), Lighting (LED/Backlight), and Ergonomics (Straps).
Here are the most popular mods ranked by difficulty (Easy to Hard).
Difficulty: 8/10 | Cost: $3 (Film) Casio sells negative display versions, but they are often hard to read. However, doing a DIY polarizer flip is a right of passage.
The SKXMOD steel case uses tiny screws for the pusher retainers. These strip easily. Use a properly sized JIS (Japanese Industrial Standard) screwdriver, not a Phillips.