For many triathletes, tracking biometric data on the run and bike training blocks is second nature, but the swim is measured only in distance covered and lap times. Now, you can get the most out of every second of training with the Garmin HRM TriHRM Swim Accessory Bundle. Designed especially for triathletes, this bundle provides all you need to track your training and race biometrics on land and in the water. This bundle includes two heart rate monitor straps the HRM Swim and HRM Tri. The HRM Swim is best served for indoor pool training because it's a non slip, chemical resistant strap with a wider profile to handle forces from wall push offs and turns. It runs on a standard CR2032 battery that's easily replaceable with a trip to the neighborhood grocery store. Its claimed battery life is 18 months when swimming an average of three hours a week. The HRM Tri is fashioned from a softer material and well suited to tracking heart rate on land or during open water swims for training and races. It also runs on a standard CR2032 battery with a claimed battery life of 10 months at an average of one hour of training per day. Both straps store heart rate data and transmit it wirelessly to your Garmin Epix, Fenix 3, or Forerunner 920XT device.