Materialabs 2ggsm 90018001900mhz gsm85090018001900mhz sim card typesim card connectivity2g 3g bluetooth40 bluetooth30 camera03 mp fitness wellnessactivity tracker community share alarm clock find my device stopwatch timer sleep tracker cpumtk6260 ram128mb typesmartwatch featureswater resistant water proof gps camera control message control hands free calls heart rate monitor camera video audio sensorheart rate sensor proximity sensor supported operation syste