http://mobile.hdblog...costa-circa-20/
- 0.42-inch OLED display shows time, step and heart rate
- Photoplethysmography (PPG) / Heart rate sensor
- Monitors your fitness and tracks your sleep
- 7g ultra light body
- IP67 ratings for water resistance
- Bluetooth 4.0 LE
- 70mAh Li-po battery with up to 20 days of standby
20€