Neewer NW570 Master Slave Wireless Flash Speedlite with Built-in 2.4G Trigger System for Nikon Cameras Such as D7200 D7100 D5200 D5100 D5000 D3000 D3100 D700 D600 D90 D80 D70 Powerful flash with guide number 58(m)/190ft(at 105mm focal length, ISO 100 in meters/feet). Recycle time: Approx. 3s Note: The speedlite could be the Master unit or Slave unit, three different groups to achieve multi-lamp creative cloth light system.( The master unit and slave unit mode apply to the same series of MK-570 flash) 2.4G Wireless remote control flash trigger, effective distance can reach up to 100m. Deluxe Kit Includes: (1)Neewer NW570 Flash + (1)2.4G Wireless Flash Trigger + (1)Flash Diffuser+(1)Deluxe Flash Case.