This bicycle phone holder is designed for mountain cycling and features a waterproof design to protect your phone from the elements. It has a 360° rotating ball joint, allowing you to switch from portrait to landscape view quickly. The holder is compatible with phones from 4.7-7.2 inches and fits handlebars with a diameter of 0.59-1.69 inches. It is easy to install and use, with a simple clamp-on design and one-hand operation, even with gloves on. The holder also features a dual protection mechanism with a lock lever on the back to keep your phone secure during high-speed riding.