This smartphone case is compatible with the iPhone 4, iPhone 4S, and most smartphones. Its clear 4" touchscreen window provides quick and easy access to touch pads while on the road. It protects phones while allowing hands-free communication. There are 2 headphone openings on the top corners of the case design and cyclists can switch from portrait to landscape for GPS use. The phone case can be clipped on and quickly released from a bar clamp mount or stem mount. Great for bikes with limited handlebar space. Stem mounts are angle adjustable for customized view angles and reducing glare.