"Highly sealed IP67 note: Heart rate data is only for reference(might not be 100% accurate), not suitable for medical purpose.heart rate monitor uses the brand new dynamic algorithm to monitor the heart rate, which is more accurate and more reliable than other smart bands as most of other smart bands in the market are only with static algorithms. Nbsp;you could tap the "new" to see the chart from us if you didn't find our chart hardware specification: display:1.3" TFT screen operation: 240*240 monitor sensor: 3D G sensor bluetooth: compatible bluetooth 4.0 (android and ios) bluetooth contact type:contact charging battery: 180mAh polymer battery chipset: Hs6620D standby time: 3-5 days compatibility:android 5.1 or above;ios 9.0 and above watch strap material: Rubber adjustable band Product size: L * W * H =255*42*11.5 mm (Total length + case diameter + thickness) Net weight: 48g Dustproof.functions: incoming call reminder, sms reminder, app notifications reminder, alarm clock, sleep detection, health and fitness tracker, step count,simulation heart rate monitor pedometer,step calorie tracker,sedentary reminder:yes others tools:alarm clock, language: English package list: 1*smart band 1*gift box 1*charger 1*user manual.