The most comfortable heart rate sensor, perfect for multisport. It records your heart rate where use of smartphones or watches are not convenient such as swimming.• Compact, comfortable fit
• Real-time heart rate and calories burned
• Compatible with Suunto Movescount App, sports apps for iPhone, Android, and Bluetooth Smart devices
• Water resistant to 30m / 100ft
• User replaceable battery
• Software upgradeable
• Adjustable strap length; minimum length 640mm, maximum length 940mm
• Strap width 30mm