Polar Verity Sense Optical Heart Rate Sensor Bag Rain Cover Width: Road 19 mm (grey) Width: Road 19 mm (grey) 34 mm (blue) 27 mm (orange) 50 mm (purple) Comfort Grip technology adds a flex to the earpads that holds the sunglasses securely without causing pressure and providing an anti bounce fit 0 USB cable No Broadcast range 15000 cm Durability Operation temperature min 20 °C Operation temperature max 60 °C Water resistance WR50 Tested against military standards No Sensors Precision Prime™ No Barometer No Magnetometer compass No Accelerometer Yes Battery Battery capacity 45 mAh Battery type Li Pol Battery rechargeable Yes Performance training mode h Eco training mode N A Smartwatch mode N A Misc Stopwatch 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 Updateable firmware Yes Swimming Specific Features