You asked and we listened. Obsidian 4 not only Streams Video at HD resolution but can simultaneously Record to the SD card inside.New controls Spin to Zoom Wheel - what could be more Natural. While the new Tactile Buttons let you feel every click for optimal control. Classical Ergonomics 21st Century Technology designed to make your Shooting Experience easy and familiar. Included: 1. Standard ring 2. Ring with Picatinny rail 3. L-shape ring