1. 1.57 Inches HD Screen&Stainless Steel Middle Frame — J-Style 2025E smart watch maximizes the screen size to 1.57" and uses 360*320 high resolution screen for a better swipe and touchscreen experience, stainless steel medical frame for more accurate ECG monitor. 2. Electrocardiogram On Demand — Detect atrial fibrillation or normal heart rhythm in just 30 seconds via ECG. After connecting with the “JChealth” App, you can get a professional ECG report after each time you finished the ECG monitor. 3. Wrist-Based Oximetry (SpO2) — Provides on demand clinically validated oxygen saturation level (SpO2) in just 30 seconds. Usually healthy people SpO2 Saturation is more than 95%, to ensure the accuracy on both normal level and Hypoxic level, we used Blood Oxygen Reduction Machine to obtain low SpO2 during testing. Testing result shows ±6% deviation between Mindary device is 98.73%. So J-Style SPO2 accuracy is as much similar as Mindary medical machine. 4. Heart Rate Tracking & Blood Pressure— Track heart rate continuously during workouts to optimize training, and monitor daily and overnight heart rate to help improve health over time.We have compared the heart rate with Apple watch, HUAWEI watch and Polar wrist and our accuracy is as great as theirs. J-Style 2025E smart watch can monitor blood pressure and output data as similar as medical device, but due to hardware limited, that could be only for reference. 5. HRV & Stress Monitor — J-Style watch can monitor the user's activity, start automatic measurement and store data when the resting conditions are met. 4 HRV level: Low, General, Good, Excellent. 4 Stress level: Calm, Moderate, Stressed, Severe. 6. Automatic Sleep Monitoring — Wake to a Sleep Score based on light & deep sleep cycles, interruptions, depth & regularity.From J-Style 2025E smart watch, you will get the sleep date per minutes and we provide with a professional sleep report on “JChealth” App. 7. Long Battery Life — Spend more time using and less time charging with a rechargeable battery that lasts up to 10 days. You can easily get full charged J-Style 2025E smart watch in about 1 hour and use it for about 7 to 10 days. 8. Smart Notifications —Connect the watch through the "JChealth" APP, open the APP to allow all permissions, you can get SNS reminders, such as Facebook, WhatsApp, Twitter, Instagram and other software information. Our watches are compatible with most Android 4.4 and IOS 9.0 and higher versions.