Weight[g] : 45 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,Distance Tracker,Activity Tracker Touch Screen : YES Category : Smart Watches App name : Setracker2/Setracker Screen Material : IPS Band Detachable : Yes APP Download Available : Yes Battery Detachable : Yes CPU Manufacturer : MediaTek Resolution : HD Touch Screen Display Size : 1.4' Touch Screen Movement Type : Electronic Style : SPORT Application Age Group : Child Screen Shape : Square Case Material : Forged Carbon 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 : 512mb ROM : 4GB System : Android OS Type : On Wrist Compatibility : All Compatible Language : English,Russian,Spanish,Polish,Portuguese,Turkish,ITALIAN,French,German,Ukrainian,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,Calculators Certification : CE,FCC Additional Features : 2G,3G,4G,Alarm,GPS,People,Sound Recorder Battery of 4G watch : 680mAh Bulit-in Battery Frequency 2G,3G,4G : GSM850\900\1800\1900MHz&TDD-LTE1900/2300/2600 Wifi/GPS : Accuracy 5-50m G-sensor : Support Remove Strap Sensor : Support