Wahoo TRACKr Heart Rate Monitor Description: Accurate, reliable, comfortable and connected, the Wahoo Trackr Heart Rate monitor offers athletes everything they need from a heart rate sensor to take their performance to the next level. Features: Provides accurate real-time heart rate data to enhance training efficiency Slim, comfortable, and secure chest strap that feels natural against the skin Impressive 100 hours of activity on one charge Connects with smartphones and a wide variety of fitness equipment to sync with the most popular training apps Standard Strap (Included) fits 26 - 35". Extra Large Strap (Sold Separately) fits 29 - 40" Specifications: Rechargeable Battery: 100+ hours Strap Length: Adjustable from 36.25 to 34.5" Maximum Chest: 50" Water Resistant: IPX7 Connectivity: ANT+ and up to three Bluetooth connections Weight: 39g (w/ Strap) Includes: (1) TICKR Heart Rate Pod (1) TICKR Heart Rate Strap (1) USB-C Charging Cable