SIM Card Slot : Nano sim card 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 App name : Setracker/setracker2 Screen Material : IPS Band Detachable : Yes APP Download Available : Yes Battery Detachable : Yes CPU Manufacturer : MediaTek Resolution : 320*320pixels Display Size : 1.4 Screen Movement Type : Electronic Style : Fashion Application Age Group : Child Screen Shape : Square Case Material : Rubber Band Material : Silica gel Waterproof Grade : Professional Waterproof SIM Card Available : Yes Mechanism : Yes Multiple Dials : Yes GPS : Yes Network Mode : 4G Battery Capacity : >450mAh Rear Camera : 1.3MP RAM : 1GB ROM : 8GB System : Android Wear,Android OS Type : On Wrist Compatibility : All Compatible Language : English,Russian,Spanish,Polish,Portuguese,Turkish,ITALIAN,French,German,Japanese,Ukrainian,Hebrew,Dutch,Arabic,Indonesian 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,Lighting,SMS Certification : CE Battery : 1000mAh 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 Google Translate : Support Stop watch : Support Removel strap reminder : Support Whatsapp : Support