Polar H10 Heart Rate Sensor Size:XS S (58 71 cm) 2015 Crave 2015 Crave Upper arm cuff with soft silicon gripper 1 USB cable No Broadcast range 9000 cm Durability Operation temperature 10 °C to 50 °C Water resistance WR30 Military standards No Sensors Precision Prime™ No Barometer No Magnetometer compass No Accelerometer Yes Battery Battery capacity 165 mAh Battery type Lithium primary battery 3V Rechargeable No Performance mode Eco training mode N A Smartwatch mode N A Miscellaneous Stop watch No Speed pace No Countdown timer No Interval timers No Manual laps No Automatic laps No Autostart stop No Vibration alerts No Alarm No Clock No Backlight No Front LED light No Date and weekday No Time of the day No Button lock No Firmware updateable Yes Intelligent design