With the chest strap based on high quality material, it can be attached to your skin closely. , Easy to use, durable, comfortable and adjustable elastic strap. , Soft fabrics and adaptive electrodes make it extremely sensitive to your heart's electrical signals. , Compatible with Most of heart rate sensors(ANT+, Bluetooth 4.0, 5.3K).Suitable for Polar, Wahoo, Garmin products.Note:It does not fit the Polar H10 monitor. , NOTE:Chest strap ONLY,heart rate sensor is NOT included.