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Youngdo Fitness Tracker with Heart Rate Monitor adopts professional PPG dynamic heart rate detection module, and optimizing algorithms for multiple exercise modes, improve heart rate accuracy. Specifications: Screen: 0.96 inch TFT color screen, resolution 160*80 Sensor: three-axis acceleration sensor Heart rate: green light dynamic Motor: Built-in for vibration reminder CPU: NORDIC 52832 Waterproof performance: IP67 level 10 meters waterproof Bluetooth version: V4.0 Connection distance: 10m (without wall) Battery: Built-in lithium battery (160mAh) Standby time: 30-35 days Working time: 7-10 days Charging time: 2.5 hours Charging requirements: 5V/500mA Charging interface: USB2.0 (no need for charging cable, the host is part of the USB plug, just pull the host out to charge) Strap material: TPU Strap length: 150mm-225mm APP compatible languages: English, Korean, Japanese, Russian, French, German, Italian, Spanish, Portuguese, Dutch, Romanian Manual language: English, German, French, Italian, Spanish, Japanese Packing list: 1* W7 Fitness tracker, 1* User Manual