With full support for Sony ADI / P-TTL, including high-speed sync, and a built-in 2.4GHz radio system, the Godox TT685S Thinklite TTL Flash will make it easy to create both simple and elaborate lighting setups. When mounted on camera, it is an effective lighting tool with a powerful guide number of 197' at ISO 100 and 200mm, a zoom range of 20-200mm, and the ability to tilt from -7 to 90° and rotate 360°. As a TTL-capable unit, the TT685S can also operate as a full wireless master or slave unit with TTL functionality.