Oigool Smart Watches for Women Men (Answer/Make Calls),1.43" Round Fitness Tracker, Smartwatch with Heart Rate Monitor Sleep, IP68 Waterproof,Blood Oxygen/Glucose/Blood Pressure

I didn’t follow the instructions that said to charge before use, it came with alllmost a full battery. I used it consistently, had it on 24hrs a day for six days before it needed a charge. Measurements of my BP and heart rate were pretty accurate to medical equipment, unsure on oxygen saturation (didn’t test that). Easy to set up on app with Bluetooth functionality.