ONrhythm 310 HRM Watch and Coded Chest Strap - grey

Stopwatch, heart rate (BPM and %HRmax), calorie and fat expenditure.

Coded analogue transmission: no crosstalk with surrounding monitors

Watch: 5 ATM (swimming) - Chest strap: 1 ATM (water splashes).

Target zones: Heart rate (BPM or %HRmax), kcal.