Product information Optical Heart Rate Monitoring – Delivers accurate HR tracking with maximum freedom of movement. Ultra-Long Battery Life – Up to 140 hours on a single charge. Massive Data Storage – Saves up to 1,000 hours of HR training records. Dual Bluetooth® Connections  ANT – Connect simultaneously to multiple devices. Multi-Function Tracking – Heart rate, sleep monitoring, and SpO₂ (blood oxygen) measurement. Seamless App Compatibility – Works with Mentech Sport app and popular third-party fitness apps. Real-Time or Post-Workout Data Viewing – Sync live with Mentech app or review data later from internal memory.   Real-Time Response, Precision Monitoring Equipped with High-Precision Optical Heart Rate Sensor & Dynamic Algorithm Real-time accurate monitoring with HR zone alerts (vibration notification) Total Sleep Wellness Guardian Massive onboard memory, Advanced sleep cycle tracking with deep/light/REM precision, 24/7 SpO₂ monitoring for restorative sleep protection Multi-Sport Pro Tracking Professional sport profiles preloaded(cycling/ running/ gym/ HIIT), Works perfectly for any workout – indoors or out, cardio or strength. (* Swimming mode is not supported yet ) UltraMAX Battery 140 hour battery life, Magnetic fast charging: 100% in 1 hour, Conquers multi-day expeditions 64MB Storage, Zero Data Loss Massive onboard memory,Stores 1000 hours of heart rate data offline Dual Bluetooth® Connections & ANT Supports both ANT and Bluetooth protocols for seamless pairing,Enabling cross-platform heart rate sharing, Seamless integration with: • 3rd-party fitness apps • GPS bike computers & smart trainers • ANT /BLE-enabled watches & gym equipment