YN-560 III is almost identical in specifications to the YN560-II except for one (possibly game-changing) addition: integrated 2.4GHz flash triggering. Any user of either Yongnuo RF-602 or RF-603 wireless triggers will be able to sync their camera with the YN560-III out of the box ¡ª a surprising capability, considering that the two systems are not themselves inter-compatible with each other. Using the flash"s LCD control panel one can select which of the 16 available channels is preferred. Then you can trigger the device from as far as 100 metres away Function: Circuit design: Insulated Gate Bipolar Transistor(IGBT) Guide No.: 58 (ISO 100, 105mm) Flash mode: M, Multi Triggering mode: Camera set-up, S1, S2, RX Zoom range: 24,28,35,50,70,80,105mm Vertical rotation angle: -7 - 90 degrees Horizontal rotation angle: 0 - 270 degrees Power supply: 4 x AA size batteries(Alkaline or Ni-MH are usable) Lighting times: 100 - 1500 times (AA alkaline cell used) Recycle time: approx 3s(AA alkaline cell used) Color temperature: 5600k Flash time: 1/200s - 1/20000s Flash control: 8 levels of output control (1/128 - 1/1), 29 levels of fine tuning External interface: hot shoe, PC port and eternal charging port Wireless triggering distance: 100m(2.4G wireless); 20-25m indoor, 10-15m outdoor (Optical control) Additional features: The electronic flash head zooming, sound prompt, automatically saving setting, power saving mode, overhearting protection and advanced options Weight: 350g Compatible with: Most Standard Hot Shoe DSLR Camera, such as Canon, Nikon, Pentax, Olympus. Except for Sony and Minolta Package include: Yongnuo YN-560 III Flash Speedlite Protection bag Mini stand Manual (English, Chinese)