SIM Card Slot : Nano sim card slot Voice assistant built-in : no Bluetooth-compatible Version : 4.0 Wi-fi : YES Metrics measured : Other Activity Tracked : Steps Tracker Touch Screen : YES Category : Smart Watches Screen Material : OLED Band Detachable : Yes APP Download Available : Yes Battery Detachable : No Resolution : 240*240pixel Display Size : 1.28inches Screen Movement Type : Electronic Style : SPORT Application Age Group : Child Screen Shape : Round Case Material : Rubber 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 : 1.3MP RAM : 512mb ROM : 512mb System : Android Wear Type : On Wrist Compatibility : All Compatible Language : English,Russian,Spanish,Polish,Portuguese,Turkish,ITALIAN,French,German,Japanese 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,Noctilucent,Calendar Certification : CE Battery : 700mAh Lithium-ion battery 3.7V GPS : L1,1575.42MHz C/A Camera : Yes Frequency 2G,3G,4G : GSM850\900\1800\1900MHz&TDD-LTE1900/2300/2600 Additional Features : 2G,3G,4G,Alarm,GPS,People,Sound Recorder SOS Call : Support Stop watch : Support