Garmin HRM-Tri and HRM-Swim Accessory Bundle SWIM HEART RATE1 - Stores up to 20 hours of heart rate data during swims, then forwards it to a compatible device at the end of the session. It also sends real-time heart rate and interval summaries to the watch NON-SLIP DESIGN - Keeps the monitor in place, even during push-offs from pool walls. COMPACT and DURABLE - Creates minimal drag through the water. HRM-Swim is the smallest and lightest heart rate monitor from Garmin. Withstands repeated exposure to all swim environments, including pools, salt water and fresh water BATTERY LIFE - Lasts for 18 months (assuming 3 hour/week use) with user-replaceable CR2032 battery Includes - HRM-Swim, manuals