?Meet your fitness goals with the help of A9 Heart Rate Monitor Calorie Bluetooth Smart Watch with Stainless Steel Band for Android &amp; iOS! Inbuilt with accurate heart rate sensor， it lets you exercise in your target heart rate zone to avoid over-exercising. Moreover， the pedometer keeps track of your activities， helping you promote a healthy lifestyle. Sleep monitor records your sleep patterns and analyzes your sleeping quality. When paired with a smartphone， this watch vibrates to alert you of incoming calls and messages as well as displays caller ID. Isn't it brilliant? Click and bring it home right now!                                    Features            Accurate heart rate sensor lets you exercise in your target heart rate zone to avoid over-exercisingInbuilt pedometer keeps track of your activities， helping you promote a healthy lifestyleSleep monitor records your sleep patterns and analyzes your sleeping qualityVibrate to alert you of incoming calls and messages as well as display caller IDPowerful MTK2502A processor ensures its high performanceSupport Bluetooth 4.0 connectionSlim and lightweight， stay comfortably on your wristNote: iOS phones only support Bluetooth dialing， Receive SMS， Caller ID display， Sync call log function. (iOS 7.0 and above system)                                                            Specifications            Model    A9    <br>Bluetooth Version    V4.0    <br>Battery Capacity    350mAh    <br>Battery Type    Polymer Lithium Battery    <br>Supported Operating System    Android and iOS    <br>Talk Time    About 3 hours    <br>Standby Time    About 120 hours    <br>Screen Type    Capacitive Screen    <br>Language    Multiple Languages    <br>Case Material    Aluminum Alloy    <br>Band Material    Stainless Steel    <br>Color    Golden    <br>Dimensions    (10.43 x 1.69 x 0.47)" / (26.5 x 4.3 x 1.2)cm (L x W x H)    <br>Weight    3.17" / 90g     <br>                                                            Package Includes            1 x Smart Watch<br>1 x User Manual<br>1 x USB Cable<br>1 x US Standard Plug<br>                                                            Extra Info            APP downloads:<br>iOS users search Mediatek SmartDevice in the apple store and install it;<br>Android users canFundo SmartDeviceapp on Google Play. (Note: Just do as this information， the manual has some mistake)