★★★Full 1 Year Walway Tech Warranty All Walway Tech products are built with high quality standards and we provide Full 1 Year Warranty and 30 Days Money Back; Walway Tech products have been well tested before shipping to you, but we cannot guarantee the parcel on the way to you, please understand us and please feel free to contact us via Amazon Message System anytime you need help, we provide Lifetime Technical Support for you and promise will do our best to help you solve any problems. ★★★Product Parameter Belt width: 1.57inches/ 4cm Diameter: (non-stretched) About 6 to 7 inches/ 15.24-17.78cm Diameter: (stretched) Extend to 12 inches/ 30.48cm Anti-slip rubber: 3 Net Weight: Approx. 2.12oz/ 60g ★★★Package Included -1x Head Strap Mount