SIM Card Slot : Nano SIM Card Voice assistant built-in : YES Bluetooth-compatible Version : 5.0 Wi-fi : YES Metrics measured : Heart Rate Monitor,Sleep Monitor Activity Tracked : Steps Tracker,Distance Tracker,Calorie Tracker,Activity Tracker Touch Screen : YES Category : Smart Watches Screen Material : IPS CPU Model : SC8541E Band Detachable : Yes APP Download Available : Yes Battery Detachable : No CPU Manufacturer : MediaTek Resolution : 320*385 Display Size : 1.96 inch Movement Type : Electronic Style : Fashion Application Age Group : Adult Screen Shape : Square Case Material : Alloy 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 : 2MP RAM : 2GB ROM : 64GB System : Android OS Type : On Wrist Compatibility : All Compatible Language : English,Russian,Spanish,Polish,Portuguese,Turkish,ITALIAN,French,German,Norwegian,Korean,Japanese,Ukrainian,Hebrew,Dutch,Arabic,Indonesian,Greek Function : Passometer,fitness tracker,sleep tracker,Message Reminder,Call Reminder,Answer Call,Dial Call,Remote Control,Push Message,Tourbillon,24 hour instruction,Chronograph,Alarm Clock,World Time,Permanent Calendar,Power Reserve,week,Month,Heart Rate Tracker,Interactive Music,Calendar,Countdown,Calculators Certification : CE,FCC,RoHS Model : P18 smart watch