The ROCKBROS HRM828 heart rate monitor chest strap uses both Bluetooth 4.0 and ANT+ protocols, making it compatible with smartphones, indoor trainers, sports watches, bike computers, and most fitness apps. The ultra-light 12g sensor features a five-zone LED display and records accurate real-time heart rate data, with a battery life of up to 50 hours from a fully charged detachable magnetic charger. Rated IP67 waterproof, it automatically powers on when worn and enters standby when removed.
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