Polar H9 Heart Rate Sensor, Black, M-XXL

The Polar H9 Heart Rate Sensor, Black, M–XXL, is a chest-strap monitor designed for real-time heart-rate tracking during running, cycling, swimming, and gym workouts. It transmits data automatically to compatible devices using three wireless protocols. This allows integration with sports watches, bike computers, fitness apps, and gym equipment. The sensor provides continuous heart-rate data to platforms such as Polar Beat for exercise-intensity monitoring and calorie-expenditure estimation. An adjustable, secure fitting accommodates a range of body sizes.

The unit consists of a plastic housing paired with a machine-washable textile strap. It is built for use in wet conditions, including swimming and high-sweat training sessions. Power is supplied by an included CR2025 coin-cell battery, and the adjustable fitting keeps the strap in place during movement. Mobile device compatibility extends to iPhone 5s and newer, as well as hardware running Android 6.0 and newer.

• Bluetooth 4.0, ANT+, and 5 kHz GymLink transmission – connects to smartphones, bike computers, and gym equipment simultaneously.
• Fits chest circumferences from 650 to 1,070 mm – accommodates M–XXL sizing.
• Sensor module dimensions of 34 × 65 × 10 mm – compact form factor worn on the chest.
• 24,000-minute battery life from a replaceable CR2025 battery – provides extended training duration.
• Machine-washable textile strap – simplifies hygiene maintenance after workouts.
• Waterproof construction – enables reliable data transmission while swimming.
• Automatic heart-rate sensing – initiates tracking without manual input.