Note： --2021 New upgraded 1.44-inch screen (old 1.3-inch) --Wearable devices monitors human activities through electronic sensors,and they are at the consumer electuonics level.It's normal for certain deviation.The user should treat data objectively. --Please do not compared to hospital equipment about reading,it is NOT a medical device! --Before using, scan the QR code on the manual to download the app and connect it to the watch with APP. -- For Android user: Please always authorize fitpro access to all phone functions and always let it operating on. and please turn on the GPS on your phone before you connect it. --Please charge it for 2-3 hours when you receive it. it was run out of power after the long delivery. Thank you! Features Heart Rate Monitor Blood Pressure Monitor Blood Oxygen Monitor Sleep Monitor Multi-sport Modes Pedometer Call or Message Reminder Call ID Display Information Push Reminder (SMS/QQ/WeChat/Skype/Facebook/Twitter/Line/WhatsApp) Auto Light-up Screen Alert Type: Vibration Other Functions: Alarm clock , Sedentary reminder, Camera remote control,Anti-lost APP Name: fitpro Specifications: CPU: Hs6620D Bluetooth Version: BT 4.0 or above Compatible OS: Android 4.4 or above , iOS 8.0 or above Operating Mode: Touch Key Waterproof: IP67,, Don't support to swimming and take a shower. Screen Size: 1.44inch TFT Resolution: 240*240 pixels Battery Battery Capacity: 100 mAh Standby Time: Around 7-10 days Using time: Around 2-5 days Charging Time: Around 2.5 hours Charging Type: Clamp charging APP Language: Korean,Russian,Spanish,English,German,Italian,Japanese,French,Simplified Chinese,Traditional Chinese Package Included: 1 * Smart Watch 1 * Manual 1 * Charging Line Notes: Note: Since it is a built-in battery product, plus long-distance transportation, the battery capacity is consumed, please charge the smart watch after receiving the product before using it.