**Optimized Product Description:**
Introducing the ATW100, the ultimate running watch designed by passionate runners for runners. This watch is your perfect companion for timing your runs with precision and ease. Its split-timer function offers versatile timing options, from 1 second to 59 minutes and 1 minute to 99 hours, ensuring you can track your performance accurately.
**Key Features:**
– **Enhanced Readability:** The watch boasts large, easy-to-read digits on the screen, allowing you to monitor your progress effortlessly, even during intense runs.
– **Waterproof Excellence:** With a 5 ATM waterproof rating, the ATW100 is designed to keep up with your active lifestyle. Whether you’re swimming, showering, or sweating it out, this watch remains fully functional and protected.
– **Versatile Split-Timer:** Measure your interval times, laps, or kilometers with the split-timer function, 
