YONGNUO YN560 IV Wireless Flash Speedlite, Master + Slave Flash + Built-in Trigger System, for Canon Nikon Pentax Olympus Fujifilm Panasonic Digital Cameras

• 2.4 GHz Transceiver with 328′ Range
• Guide Number: 190′ at ISO 100 and 105mm
• Zoom Range: 24-105mm (18mm with Panel)
• Output Range: 1/1 to 1/128