Accept no imitations or limitations. There is only one Timex IRONMAN* Triathlon®. Stylish enough for the weekend warrior, technical enough for the extreme athlete. Don't swim, bike, run, jump, climb, throw, or kick without one.Product Details:Heart Rate MonitorGrey and Black Resin StrapINDIGLO® night-lightWater Resistant to 50mSize: MediumAdditional Features:One-Year WarrantyAlarm Features30 lap recall2.5 Year Battery Life