1.Multifunctional 6-in-1 chest strap set: contains 1 x chest strap, 1 x J hook, 1 x thumb screw, 1 x adapter screw, 1 x phone clip and 1 x silicone mat, suitable for mounting sports cameras and smartphones. 2.[Wide Application] Free your hands, ideal for outdoor sports, extreme sports and underwater photography, such as cycling, running, climbing, diving and more, and provide a camera angle from the eyepiece. 3.[Adjustable Chest Strap] Made of high quality polyester material, padded, elastic and breathable, suitable for a variety of body types; quick release design, easy and comfortable to wear. 4.[Rotating phone clip and silicone mat] Adjustable length from 5.3/2.0 inches to 10 cm/3.9 inches, supports horizontal and vertical photography; with silicone mat to better fix the phone to prevent accidental drops.