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Precaution:1. If you have certain medical conditions, please consult with health or medical practitioners/professionals first before use.3. The accuracy of various measurements from J2025E smart watch are as follows:2. J2025E smart watch is not a medical device due to various factors. For example: the ECG from any smart watch brand provides single lead data while the medical ECG for human body provide multi leads data. The single lead data is still a good reference for personal consideration.- Heart Rate Accuracy: ±3 compared with Polar Chest Strap,- Temperature Accuracy: ±0.2 ℃ compared with Fluke Thermostatic Water Tank,- Heart Rate or ECG wave: similar to Apple watch and Mindray medical ECG machine, and- SpO2 (Blood Oxygen) Accuracy: ±6% compared with medical-grade monitor Mindray,3. Please do not overcharge the smart watch as it may affect the battery performance.- HRV or Blood Pressure Accuracy: due to the sensor limitation on smart wearables, data is only for daily reference.4. JCLife or JCHealth is free.5. Always test everything you need from this smart watch before removing anything from smart watch and recharging it again.If any issue with the smart watch after following the standard precautions and instructions we give, please contact us directly.If you have removed something (i.e. the plastic screen protector) from the smart watch or done the second recharge, it is considered a used smart watch.6. The human made mistake(s) caused by inappropriate use(s) will not be covered by our eBay policy.