Viltrox Speedlite JY-680Nh i-TTL High-Speed 1/8000s HSS Flash Light for Nikon D810 D7100 Camera Studio Photography

Viltrox Speedlite JY-680Nh i-TTL High-Speed 1/8000s HSS Flash Light for Nikon D810 D7100 Camera 

Suitable for: Nikon iTTL camera.
High sync speed: 1/8000s
GN: 58(ISO 100m)
Flash coverage: 18-135mm(14mm with wide panel)
Sync mode: High-speed sync, front-curtain sync, Rear-curtain sync
Flash duration: 1/1050s(under output 1/1)
Flash recycling: 0.3-5 sec
Wireless transmission range: indoors: 12-15m/39.4-49.2ft
outdoors: 8-10m/26.2-32.8ft
Reception angle: ±40° horizontal, ±30°vertical
Internal power: 4*size-AA alkaline batteries
*size-AA Ni-MH and lithium batteries also usable
Battery life: 100-700 flashes(with size-AA alkaline batteries)
Weight: Approx.380g(excluding batteries, only flash)
Power saving: Power saving after certain period of idle operation approx 4min.