[[High Performance of Real-time Heart Rate Tracking] H603 directly extract heart rate data with the self-research algorithm eliminate noise interference caused by movement and sweating output the most accurate heart rate data [SPLIT CHEST STRAP DESIGN] Different from the traditional chest strap design H603 adopts split chest strap design to bring you a better product experience [LONG BATTERY LIFE] Lasts for 1000 hours: 1 hour per day 4 times per week2.5 years working time. (The battery life data are based on laboratory test. The actual situation may be slightly different due to the use environment and other factors [Compatible Ant+ & Bluetooth] 2 data copies for 1 workout recording via ANT+ device and Bluetooth App at the same time with stable transmission. ANT+: Magene Wahoo IGPSPORT Bryton Black Bird Bluetooth: Zwift Onelap Strava Kinomap Wahoo Fitness TrainerRoad Rouvy Fulgaz Nike Run Clus Openrider Elite HRV Selfloops HRV [IP67 Dustproof and waterproof] Meets your waterproof and dustproof needs during daily use. 1 year warranty (man-made damage is not covered by this warranty) LED Light Reminding: H603 has a flashing LED light that confirms your heart rate and connection allowing you to easily stay focused and improve efficiency during any activity or exercise. After the sensor is properly worn it will automatically turn on the front LED flashes (turns off after 10 times). * Note: The red light indicates that the monitor is ready to use [Colorful shell] The H603 heart rate monitoring chest strap shell adopts IML (In Mold Label) injection molding technology which is wear-resistant and scratch-resistant and will not fade even if it is used for a long time in a sweaty environment. 4 colorful shells can meet your different wearing environment needs]