The shell is made of high quality material, which has good waterproof performance, which can effectively protect the mobile phone Transparent touch screen which provides over 90% sensitivity, ensures maximum ease of use during cycling Universal rotating ball design, 360° rotation, horizontally and vertically freely, wider navigation field of view, and more convenient to use Built-in EVA sponge, effective shock resistance, more drop resistance Specifications: Material: EVA+ABS+waterproof PU Applicable models: For Samsung Galaxy S8+/S9+/Note series/for iPhone XR and other models within 6.3 inches (Note: As this is related to the screen to body ratio of the phone, it needs to be determined based on the actual size) Installation instructions: 1. Both the waterproof bag and bicycle base can be disassembled. 2. When installing the bicycle base, clip the base into the buckle groove on the back of the waterproof phone bag to fix it (it requires a little effort, and the sound of "clicking" means it is fixed). 3. Open the zipper, put the phone in the waterproof phone bag (depending on whether a gasket is required), and then close the zipper.