Adjustable size: the size is one meter in length, and the distance between the two holes is 45mm.
Compatible with heart rate sensor: Support 5MM center distance heart rate belt with universal Bluetooth transmitter.
Made of nylon and spandex material to fit your skin tightly. The soft fabric and electrodes make it sensitive to your heart’s electrical signals.

Versatality: Polar OH1 allows you full freedom of movement regardless of your sport. Wear Polar HR monitor either on your arm when rowing, cycling, running or training indoors or against your temple when swimming
Comfort: The soft textile armband keeps Polar OH1 snug around your arm. The swimming goggle strap clip, included in the Polar OH1 + package, keeps Polar HR sensor steadily in place when you swim
Connectivity: Pair HRM with the free Polar Beat fitness app, Strava or Nike, your sports or smart watch (Polar, Garmin, Apple, Suunto and others), bike computer or gym equipment (Peloton) via Bluetooth or ANT+ simultaneously

ACCURATE AND PROFESSIONAL: Fitcent HRM provides top quality measurement for many pro athletes with training, the primary item HAS to be accurate is the heart rate, our HRM helps them to obtain accurate heart rate. Note: Please remember moisten the electrode area of the chest strap with water before wearing it.
SOFT ADJUSTABLE CHEST STRAP: Built with super comfortable, soft stretch material the chest strap is designed to handle ALL-DAY, NO CHAFE comfort during your workouts. A fully adjustable chest strap can be adjusted from 27.5″ to 41.3″ (M-XXL). It comes with a Maxell CR2032 cell battery(MADE IN JAPAN), battery life lasts up to 12 Months and can be replaceable.
BLUETOOTH SUPPORT: Support with bluetooth 5.0, compatible with Hundreds of third-party fitness apps including Polar beat, Zwift, Elite HRV, Heart Graph, Wahoo Fitness, Endomondo, Adidas run, Peloton, and many more.