best activity tracker with heart rate

{"title":"SMS Reminder IP67 Step Counter Wristband","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/86\/74\/46cc5dceb3dabc631e0a7ffc7b75-200x200-1.jpg","attrs":{"Price":"USD 8.9\/PCS","Brand Name":"OEM\/ODM","Model Number":"C11","Minimum Order Quantity":"1000PCS","Delivery Time":"15-20 days","Certification":"CE FCC ROHS","Place of Origin":"Guangdong, China","Payment Terms":"L\/C, T\/T, Western Union, MoneyGram","Supply Ability":"500K\/month","Packaging Details":"single package size: 90*90*30 mm ; gift box\/PCS ; 50 boxes\/CTN","MCU":"Dialog-DA14585","Bluetooth":"Support BLE4.0","Screen":"0.87'' OLED","Machine Size":"255*16*3.0mm","Device Weight":"8.3g","Band Material":"TPU","Shell Material":"TPU + PC","Battery":"Lithium polymer battery;80mAh","Duration of standby":"About 7 days","BP & HR sensor":"EM7028"}}