Materialabs 2ggsm 90018001900mhz gsm85090018001900mhz sim card typesim card connectivitybluetooth30 2g 3g bluetooth40 camera03 mp fitness wellnessalarm clock find my device stopwatch timer sleep tracker activity tracker community share cpumtk6260 ram128mb typesmartwatch featureshands free calls heart rate monitor camera video audio water resistant water proof gps camera control message control sensorheart rate sensor proximity sensor supported operation syste