Built-in 2.4GHz X wireless radio system Compatible with Nikon i-TTL Guide number: 197-feet at ISO 100 and 200mm Zoom range: 20-200mm (14mm with panel) Tilts from -7 to 90 degrees Rotates left and right 180-degree Wireless master/slave TTL functionality Recycle time: 1.5 seconds at full power High-speed, 1st and 2nd curtain sync Runs on a rechargeable Li-Ion battery pack