Highly sealed. Ip68 real waterproof, could support wear when swimming, from apltch only(dear customer, we suggest that you fully dry it after taking it out of water for charging protection and frequently using it or long time in water may influence its working life which is out of our warranty, thanks for your understanding) note: Blood pressure data is only for reference(might not be 100 percent accurate), not suitable for medical purpose. Heart rate monitor uses the dynamic algorithm to monitor the heartrate, which is more accurate and more reliable than other smart bands as most of other smart bands in the market are only with static algorithms. Hardware specification: Display: 0. 96 oled touch screen operation: Curved touch monitorsensor: Three-axis gravity acceleration sensor acceleration bluetooth: Compatible bluetooth 4. 0 (android and ios)ble contact type: Contact charging battery: 85mah polymer battery standby time: 15 days compatibility: Android 4. 4 or above, ios 8. 0 and above watch strap material: Silica gel adjustable band length: 256mm, * weight: 19. 8 * 67mm weight: 20gram waterproof level: Ip68 waterproof functions: Incoming phone reminder, sms reminder, app notifications reminder, alarm clock, sleep detection, health and fitness tracker, step count, simulation blood pressure monitor: Yes heart rate monitor: Yes fatigue value monitoring: Yes pedometer, step calorie tracker, sedentary reminder: Yes others tools: Alarm clock, bluetooth-camera language: English.