A. ### 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) B. ### Product Features 1. Comfortable and soft chest strap: Our chest strap is made of a blend of nylon and spandex, designed to offer a relatively long period 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 regularly, it is advisable to have an extra chest strap. 3. Comfort: Attention is paid to details and materials are carefully selected. The product features are competitive, and efforts are made to meet your expectations. 4. Technical support: Our team offers 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 washed (not suitable for use while swimming).