Neewer VK581 i-TTL Master Slave Speedlite FlashlightHigh-Speed Sync for Nikon D7100 D7000 D5200 D5100 D5000 D3000 D3100 D300 D300S D700 D600 D90 D80 D70 D70S D60 D50 and all Other Nikon Models Powerful Flash with High Guide 60m/196(at 105mm focal length,ISO 100 in meters). Lens Coverage 24mm - 105mm. Super fast recharging cycle, 3 second charging cycle after a full level output, can be accelerated by an external power pack With large LCD panel, you can look into and set the functions on the LCD panel clearly and directly. High-Speed Sync. Providing external power source socket and PC port. This speedlite is an EOS-delicated,high-output flash unit automatically compatible with i-TTL auto flash. It can serve as an on-camera flash as well as a master unit or a slave unit in a wireless,multiple-Speedlite system.