uto Electronic Flash with Pre-Flash Metering_x000D_ Powerful and versatile with a flash coverage setting of 105 mm and a guide number of 46 (ISO 100)_x000D_ Fast Recycling time of 0.1-2.5 seconds (depending on the battery type), allowing for rapid shooting without long waits between flashes_x000D_ Wireless Flash Control ability to control the flash wirelessly (2.4 GHz band, 14 channels, up to 30 meters)