Compatible with both the iPhone 4 and 4S, the Olloclip easily connects to the corner of your phone and aligns automatically. It features 3 lens options. The fisheye that captures a nearly 180 degree field-of-view. The wide-angle lens that approximately doubles the usual field of view of the iPhone and the macro lens that applies roughly a 10X multiplier and allows you to focus the iPhone within 12-15mm of the subject.

The Olloclip in action: