SZOS is a health application for Android that can track the amount of exercise and calories consumed every day. It can accurately record the user's heart rate and blood oxygen saturation. SZOS can detect the user's sleep status at night and deeply analyze the factors affecting sleep quality. It can help users to get a better night's sleep and be their personal assistant. SZOS can record the exercise data of the users and save it for later use. It can support a variety of wearable devices.