Features: High GN: 58 Wireless trigger sensor Electrical socket outlet PC synchronous interface Recycle time 3 second (with 4 pcs AA alkaline cell) Support Multi-flash lighting Application (S1/S2 mode) Power saving mode Accurate brightness control LCD display Metal hot shoe Support front curtain synchronous Temperature detection Automatically (overheating protection) Memory function SUITABLE FOR CANON CAMERAS support E-TTL II / E-TTL Flashes. Specifications: Circuit design: Insulated Gate Bipolar Transistro(IGBT) Guide Number: 58meters (ISO 100,105mm) Flash mode: M,MULTI,S1,S2 Wireless triggering distance: 20--30m indoor,10--15m outdoor Flash coverage range: 24,28,35,50,70,80,105mm Vertical rotation angle: 0-90 degrees Horizontal rotation angle: 0-270 degrees Power supply: 4XAA size batteries(Alkaline or Ni-MH are usable) Lighting times: 100-1500 times(AA alkaline cell used) Recycle time: approx. 3s Color temperature: 5600k Flash time: 1/200s--1/20000s Flash control: 8 levels of output control(1/128--1/1) External ports: Hot shoe,PC port and eternal charging port (Use MK-SD8A) Additional features: FEC, AEB, Manual zoom, Auto zoom, PC port Package Contents: 1x VK750 Speedlite for Canon