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
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.
Activity tracking 
Heart rateYes
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
GPStaps into the GPS on your phone
Running features
Swimming features
Smartphone notificationsYes
Other Inactivity alert, Vibration alerts, Alarm, Sport profiles
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