Product Material: Nylon + Spandex + SiliconeDimensions: Length 1 mDistance between two holes: 45mmSupport: 5MM center distance heart rate belt universal Bluetooth transmitterColour: BlackQuantity: 1 pcsPackage content: 1 pcs * Heart rate belt1.Super comfortable and soft strap: Made of a blend of nylon and spandex, our strap is specially designed for more than 15 hours of comfort.2.Reliability: walking, light jogging or long distance? Keep an eye on your heart rate and read your heart rate history on your mobile phone, app or watch. If you train regularly, we recommend you add an additional chest strap.3.Comfortable: With great attention to detail, we have set ourselves the goal of exceeding your expectations every day with a hand-selected selection of high-quality materials and superior product features compared to competitors.4.Technology: Our team supports you when connecting the strap as well as choosing the right app. Unisex universal size , stretchable to 100 cm. Easy to adjust and put on.5.Waterproof, friction-free soft rubber: The quick-connect electrode is protected by a soft-touch, waterproof and sweat-proof rubber coating. Fully washable (not suitable for swimming).