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