1. ### Product Description 1. Material: Nylon + Spandex + Silicone 2. Size: 1 meter in length 3. Distance between two holes: 45 millimeters 4. Compatibility: Compatible with a universal Bluetooth transmitter for heart rate belts with a 5 - millimeter center - to - center distance 5. Color: Black 6. Quantity: 1 piece 7. Package contents: 1 heart rate belt (chest strap only) 2. ### Product Features 1. Super comfortable and soft chest strap: Our chest strap is made of a blend of nylon and spandex, designed to provide over 15 hours of comfort. 2. Reliability: Whether you're taking a walk, jogging, or running a long - distance race, it can monitor your heart rate in real - time, and you can view your heart rate history on your phone, app, or watch. If you train frequently, it is recommended to have an extra chest strap. 3. Comfort: We pay attention to details and carefully select high - quality materials. The product features are superior to those of our competitors, and we strive to exceed your expectations every day. 4. Technical support: Our team provides support in connecting the chest strap and choosing the appropriate app. The chest strap is a unisex size and can be stretched up to 100 centimeters, making it easy to adjust and wear. 5. Waterproof and friction - free soft rubber: The quick - connect electrodes are protected by a rubber coating that feels soft, is waterproof, and sweat - resistant. It can be completely washed (not suitable for use while swimming).