Languagesenglish english capacity mah85 85 materialsilicone connectivitynfc nfc bluetooth40 bluetooth40 fitness wellnessalarm clock alarm clock find my device find my device stopwatch stopwatch sleep tracker exercise reminder sleep tracker exercise reminder activity tracker sedentary reminder activity tracker sedentary reminder cpunrf51822 nrf51822 charging timeh18 18 typesmart bracelet smart bracelet featuressports heart rate monitor sports distance tracking anti lost