From the IRONMAN Classic Collection.The Timex® IRONMAN® HRM + Activity Tracker is a watch born of necessity. Inspired by a renewed appreciation for our health, wellness and the great outdoors, this sporty 43mm timepiece is designed to help empower a better, healthier you. Featuring an easy-touch heart rate and daily activity monitor, the IRONMAN HRM + Activity Tracker is battery operated — no app, no charging, just function — and comes complete with a battery hatch on the case back for an easy battery swap when necessary. Timex has packed in all the practical features you’ve come to expect from the Timex IRONMAN series including 50 meters of water resistance, INDIGLO® backlight, chronograph, alarm and timer plus an impressively comfortable black resin strap.