SP2 COMPUTER CHEST STRAP

Sporasub SP2 Freediving Cardio Strap:

The Cardio Chest Strap (optional) can be used both in Dive and Chrono mode. It features 5,3 KHz allowing underwater data transmission.
The Dive Master software (download) allows dive data downloading of: dive time, maximum depth, water temperature, total calories, max/min heart rate (only using Cardio Chest Strap).