Product information: - Size: 48.5mm (Diameter)*16mm - Screen type: E-ink 1.2'always on - Positioning: GPS+ Beidou+Glonass - CPU: 2523G - 6-axim Sensor: ST-LSM6DSM - Bluetooth: version 4.2 - Strap: 24mm - Battery capacity: 450mAh - Weight 87.5g - IP68 Waterproof More details: - Connect to 3 positioning satellites GPS, Beidou and Glonass - 12 Sports modes: Running, Cycling, Hiking, Climbing, Marathon, Golfing, Treadmill, Surfing, Boating, Skiing, Rock Climbing - Compass - Thermometer - Barometer - Ultrafast optical heart rate sensor, upload heart rate to app every 30 mins in normal mode, real time heart rate in sports mode - IP68 waterproof - Battery life: 4-9 days normal use, 10.5-14.4 hours when GPS is on - 1.2 Inch E-ink always on screen - Smart notification - Target navigation - Chart for heart rate and pace