This master & slave speedlite is equipped with special hot shoe contacts， compatible for Canon/Nikon DSLR cameras. HSS is up to 1/8000s， support i-TTL and E-TTL mode. 

Features: 
Dual mode， special hot shoe contacts， compatible for Canon/Nikon DSLR cameras. 
Wireless master function: support for Canon wireless flash and for Nikon command flash. 
Wireless slave unit function: compatible for Canon/Nikon wireless flash system， can achieve TTL off camera， manual and frequency flash. 
With a high guide number of GN58. 
High speed sync， up to 1/8000s. 
Support TTL/Manual/Multi/S1/S2 mode. 
Manual and auto zoom， flash coverage from 18-180mm. 
Ultra fast recycle time only about 2.3s. 
Support LED lighting mode， can be used as a fill-in light. 
Support camera menu access function.(Only for Canon of the newest version) 
Support exposure FEB， exposure compensation， flash exposure lock. 
Support rear-curtain sync/voice prompt/custom function/power save mode/overheating protection. 
Support two power supply: li-ion battery and external DC power. 
LED lighting mode to meet your different needs. 

Specifications: 
Circuit Design: IGBT 
Guide Number: GN58(ISO100，180mm) 
Flash Coverage: Manual/Automatic Zoom 18-180mm(With flash head rotation to achieve reflection flash) 
Flash Mode:TTL/M/Multi/Sc/Sn/S1/S2 
Wireless Trigger Method：Light pulse， Induction flash light 
Wireless Flash Distance: Indoor 20-30m， Outdoor 10-15m 
Support subordinate unit: 4 channels(1/2/3/4) and 3 slave unit(A/B/C) 
Rotation Angle: Up and down -7-90 degree;Left and right 0-180 degree 
Flash Time: 1/200s-1/20000s 
Manual Flash Control: 1/128-1/1， 22 levels of fine tuning 
Recycle Time: 2.3s 
LED Power: 3W 
External Interface: Hot shoe， PC sync interface， external DC interface   
Power Supply: 7.4V Lithium battery / DC power supply 
Additional Features: Power saving mode， overheating protection，