description wrist-based health smart bracelet with activity tracker - intelligent health monitor function: measure blood oxygen and pressure, fatigue and heart rate - well appointed communication tool: receive call, message, calendar and notification of app - multiple sports recorders and trackers: track sports steps, distance, calories, etc. - excellent wristband performance: remote camera, anti-lost function, ip67 waterproof 1. master body condition tenfifteen a58 uses advanced technology to monitor heart rate at the wrist, which gives you the freedom to work out however you want, with no additional heart rate strap needed. after connecting to the app, you are able to measure blood oxygen and blood pressure, knowing your physical condition at all times and places. fatigue also can be checked at the app. it will send a signal to tell you whether it's time to take a rest. 2. measure activity intensity using sports tracker, a58 smart wristband provides calories burned information. this allows you to compare calories consumed to total calories burned, whether you're going for a jog or trying out a new boot camp class, it quantifies the intensity of your fitness activities using intensity minutes. with the features of pedometer and distance measure, it is easy to know how many steps you've taken and how far you've gone. 3. keep in contact the a58 model supports smart notifications when paired with a compatible device. when you have incoming calls or sms, the bracelet will vibrate and show the content. convenient to receive call or message right on your watch no matter you're on the trail or simply awayyour desk. notificationsthird-party software such as wechat, qq can be checked via connecting the app. 4. perfect design and function with the anti-lost function, the bracelet will give a reminder when the working connection distance is out of range. it's cool to control your mobile phone's camera by the a58. reaching the switch is no longer a problem. ip67 waterproof enables bracelet to be held in the rain, in the process of washing hands, bathing, taking shower, swimming, etc. buyers guidelines: 1. be compatible with bluetooth version 4.0, android os 4.4 or above ; for iphone ios 8.0 or above 2. ip67 waterproof means that stepping depth doesn't exceed one meter and steeping time doesn't exceed 30 minutes 3. please scan the qr code: 1491902028173483 or search "hey band" at apple store or android market to download the app 4. filling up the bracelet takes about 2 hours frequently asked questions q: does it need a sim card to operate? a: no. it can be used independently but some of the functions need to be connected with your phone. q: how long can the bracelet work and stand by? a: the wristband's working time is about 7 while stand-by time is about 20 . q: does the bracelet come with built-in camera? a: the a58 bracelet does not have this function, but you can remote control your smartphone's camera via connecting bluetooth. bluetooth version: bluetooth 4.0 people: female table,male table waterproof: yes waterproof rating : ip67 screen: yes screen type: oled compatible os: android,ios compatability: android 4.4 / ios 8.0 and above system language: english battery type: lithium polymer battery battery capacity: 100mah power: built-in battery standby time: about 20 functions: alarm clock,call reminder,calories burned measuring,camera remote control,date,distance recording,measurement of heart rate,notification of app,pedometer,sedentary reminder,sitting posture reminder,sleep management,sms reminding shape of the dial: rectangle case material: abs band material: tpu tpe the dial thickness: 1 cm / 0.39 inches the dial diameter: 2.5 cm / 0.98 inches the band width: 2 cm / 0.79 inches wearable length: 14.5 - 22.5 cm / 5.71 - 8.86 inches brand name: yanziwu model: a58 function: passometer,message reminder,sleep tracker,remote control,activity tracker,heart rate tracker,altitude meter,blood pressure,call reminder,fitness tracker,blood oxygen,push message band detachable: no touch screen: yes application age group: adult case material: alloy waterproof grade: life waterproof language: english band material: silica style: fashion screen type: led compatibility: all compatible screen style: rectangle/square-shape compatibility