Timex Women's T5K389 Ironman Pulse Calculator Digital Watch Entry-level functionality for fitness enthusiasts coupled with the quality and durability of Timex ironman watches Easy to use pulse calculator. 24-hour stopwatch. Alarm with 5 minute back-up. 12 preset timers with halfway alert On-screen instructional prompts when setting. Available in a comfortable and durable resin strap Easy to view in low light conditions with indiglo night-light Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving