SIM Card Slot : Nano sim card Voice assistant built-in : no Bluetooth-compatible Version : NONE Metrics measured : Heart Rate Monitor,Blood Oxygen Monitor,Blood Pressure Monitor Activity Tracked : Steps Tracker,Distance Tracker,Calorie Tracker Category : Smart Watches CPU Model : SC9820E Band Detachable : Yes APP Download Available : Yes Battery Detachable : Yes CPU Manufacturer : MediaTek Resolution : 240X240 Display Size : 1.4' Touch Screen Movement Type : Electronic Style : SPORT Application Age Group : Child Screen Shape : Square Case Material : Carbon Fibre Band Material : Silica gel Waterproof Grade : Life Waterproof SIM Card Available : Yes Mechanism : Yes Multiple Dials : Yes GPS : Yes Network Mode : 4G Battery Capacity : >450mAh Rear Camera : None RAM : 512mb ROM : 4GB System : Android OS Type : On Wrist Compatibility : All Compatible Language : English,Russian,Spanish,German,Dutch Function : Passometer,sleep tracker,Message Reminder,Call Reminder,Answer Call,Dial Call,Remote Control,Push Message,Big Three Needles,24 hour instruction,Alarm Clock,Small Second,World Time,Permanent Calendar,Power Reserve,week,Month,Heart Rate Tracker,Noctilucent,Thermometer,Calendar,Lighting,Calculators,Blood pressure and oxygen monitoring Certification : CE Additional Features : 2G,3G,4G,Alarm,GPS,People,Sound Recorder Battery : 700mAh Bulit-in Battery Frequency 2G,3G,4G : GSM850\900\1800\1900MHz&TDD-LTE1900/2300/2600 Wifi/GPS : Accuracy 5-50m G-sensor : Support SOS Call : Support Blood pressure monitoring : Support Blood oxygen analysis : Support Sedentary reminder : Support Take medicine reminder : Support WI-FI : Yes