Here is a heart rate master for health and happiness! Our Accurate Digital Heart Rate Monitor Watch with Elastic Chest Belt is designed for all vigorous sport lovers who have outdoor exercise regularly! It adopts advanced electronic components to guarantee high accuracy and stable performance. The digital display allows you to read the specific heart rate easily and conveniently. Moreover， with the elastic chest belt， you can wear our heart rate monitor watch comfortably when you are climbing， running or having other sports!                                    Features             Accurate digital watch with various functions for monitoring heart rate<br> Easy and comfortable to wear<br> The digital display allows you to read the specific heart rate easily and conveniently<br> Equipped with a piece of elastic chest belt for easy wearing and carrying<br> The battery has about 36 months service time<br> Designed for all vigorous sport lovers who have outdoor exercise regularly <br>                                                            Specifications             Color     Black    <br> Dimensions     (7.68 x 1.85 x 0.51)" / (19.5 x 4.7 x 1.3)cm (L x W x H)    <br> Weight     5.53oz / 157g    <br> Package Dimensions     (4.61 x 4.57 x 3.39)" / (11.7 x 11.6 x 8.6)cm (L x W x H)    <br> Movement Size     Φ33.2mm    <br> Thickness     9.35±0.15mm    <br> Work Temperature     -10℃~+60℃    <br> Work Voltage     3V    <br> Veracity     ±90 Seconds/Month    <br> Battery Type     CR2032 Bttery    <br> Static Maximum Drive Current     ≤3.5 u A(T=25℃)    <br> Static Average Drive Current     ≤2.5 u A(T=25℃)    <br> Heartbeat Monitoring Current     ≤30 u A(T=25℃)    <br> EL Lighting Current     ≤10.0 m A    <br> Alarm Ring Current     ≤2.5 m A    <br> Battery Life Term     36 Months(Japan Battery)       <br>                                                             Package Includes            1 x Heart Rate Monitor<br>1 x User Manual<br>1 x Chest Band<br>