Highly sealed. IP68 real waterproof, could support wear when swimming, from apltch only(dear people, 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) ECG and Heart rate monitor uses the brand new dynamic algorithm to monitor the heart rate & ECG 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. Smart band model: Mantara is the only actual vendor for this listing, any other vendor giving on this listing is giving false items which will be involved in the brand infringement and we will take actions for this. And nbsp, you could tap the new to see the chart from us if you didn't find our chart hardware specification: Display: 1.3 OLED HD screen 240*240 HD Display operation: Curved monitor sensor : CPU- MTK2502 Sensor:G-sensor and Data Save Time 3 months acceleration bluetooth: Compatible bluetooth 4. 0 (android and ios)ble contact type: Contact charging battery: 280mah polymer battery standby time: 5-6 Days compatibility: Android 4. 4 or above, ios 8. 0 and above Watch:46*46*12.3mm watch strap material: Leather weight : 46 gram and Steel : 66gram waterproof level: IP68 waterproof functions: Bluetooth Calls, Incoming call reminder, sms reminder, app notifications reminder, alarm clock, sleep detection,ECG and PPG,health and fitness tracker, step count, simulation Yes heart rate monitor: Yes fatigue value monitoring: Yes pedometer, step calorie tracker, sedentary reminder: Yes others tools: Alarm clock, bluetooth-camera,Call Logs,Bluetooth Call and Calculator language: English.