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★★ Note: The measurement results of YZJ fitness tracker are for reference only and cannot be used for medical purposes. ★★ OS requirements: Android 4.4 and IOS 8.0 or above versions supported. (for smartphones only, not for PC, iPad or tablet) ★★ How to measure BP and HR? Please put the fitness tracker on your hand and click on the interface to the blood pressure,stay for a little while,the blood pressure will appear. Similarly, measuring the heart rate is also the interface to click on the heart rate,stay for a little while,the heart rate will be displayed. Function Instruction: ♛ time modes ♛ Sports record ♛ Calories mode ♛ Heart rate monitor ♛ Blood oxygen monitor ♛ Blood pressure monitor ♛ Sleep monitoring ♛ Call/Message/APP reminder ♛ Sedentary alert Specification : * Bluetooth Version: Bluetooth 4.0 or later * Bluetooth Transmission Distance: 10 Meters (33 feet) * Screen size: 0.96 inch * Screen type: OLED * Battery type: Li Battery * Battery capacity: 80mAh * Material: upper casing: PC; strap: TPE * Working time:3-7days * Charging method: Built-in USB charging * Charging time: 1-2 hours * Weight: 0.81 Oz (23g) * Waterproof: IP67 Package : 1*Fitness Tracker 1*User manual