L8star Fitness Tracker, Activity Tracker with Heart Rate Sleep Monitor 1.3inch C... $19.89 Make sure this fits by entering your model number. ✅ 【Heart Rate & Sleep Monitoring】：Measuring your heart rate on every 1 / 2 / 6 / 12 hour automatically, and you can also set up real-time heart rate tracking or manually tracking once you set it up in the app. Also support automatic sleep monitoring from 6:00pm to second day you get up, it records deep sleep, light sleep, stay up and awake states. Clearly acknowledge your physical fitness status at whole day / week / month. ✅ 【30 Days Long Battery Life】：Charge 2 hours, standby 30 days, normal use 15 days. A time full charge gives you 15 days normal use, 30 days working. I think it will greatly save your charging time and improve the efficiency of use.