Polar A370
Tech specs 
SizeThickness: 13.5 mm
Width: 23.5 mm
MaterialSoft Silicone or Polyurethane (TPU) wristband
ChargingMicro USB
Battery110 mAh Lithium-polymer battery
Battery lifeUp to 12 hours of training with mobile GPS
4 days of activity tracking with continuous heart rate and 1 h of training per day
Water-resistanceWR30
Weight31.7g (S), 37.3g (M/L)
Sensor3d-accelerometer, heart rate monitor
DisplayWide-viewing angle full color TFT display with capacitive touchscreen
Screen resolution 80 x 160 pixels (RGB)
Screen size13mm x 27mm
ColorsAvailable in 6 colors.
Other
Activity tracking 
StepsYes
DistanceYes
Calories burnedYes
ActivityYes
Floors
SleepYes
Heart rateYes
Vo2Max
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPStaps into the GPS on your phone
Running features
Swimming features
Other Inactivity alert, Vibration alerts, Alarm, Sport profiles
Non-fitness functions 
Smartphone notificationsYes
On-board music storage
Connected pay
Links 
Affiliate link*Amazon
Read moreArticle
*Disclosure: We are a professional review site that receives a small commission from sales of certain items, but the price is the same for you. See our affiliate disclosure page for more details.
**All tech specs and images on this page come from manufacturers. These may change over time as manufacturers sometimes update their devices. While we cannot guarantee absolute accuracy of information on this page, we promise to review this content regularly and do our best to bring you the most up-to-date information. To be absolutely sure of tech specs of a particular device, we recommend checking the manufacturer’s website.