It can be work on canon,nikon Pentax Olympus as well
The YN560 is a manual flash specially designed for professional photography. 
The details as following: 
1. High Quality materials and finish. 
2. Power Zoom function: focal length range from 24 to 105mm. By pushing the button on the flash. 
3. GN58 @ ISO100,105mm. Similar to Canon 580EXII and SB-900 
4.
Improved Wireless triggering sensor: S1 & S2 mode can be used in
outdoor environment and the wireless triggering distance is up to 15m. 
5. Charging socket for external power pack. Same as 580EXII SF-18. 
6. PC sync port. 
7. Fast charging Recycle: Takes 3 seconds in charging after full power output. 
8.
Support high speed continuous shooting: With the output level of 1/8 or
below, YN560 can support the 8FPS high speed continuous shooting. 
9. Improved Power Saving mode: Power saving mode can be on, or off. 
10. The automatic setting saving: automatically saves your current setting. 
11.Fine manual output control: ranges from 1/128 to 1/1.
12.Sound
indicator: When the charging process is finished, the flash will give a
tick sound. (Note: the sound can be turned off). 
Can be triggered using IR, another flash, cord or radio wireless system. 

Specifications: 
Guide number: 58 
Circuit design: IGBT 
Flash mode: M, S1, S2 
Zoom range: 24, 28, 35, 50, 70, 80, 105 
Up/down wide angle: -7~90 degree 
Left/right angle: 0~270 degree 
Power Source: 4 X AA size batteries (Alkaline or Ni-MH ) 
Battery Life: 100 - 1500 times (with alkaline batteries) 
Recycle Time: approx 3 sec(with alkaline batteries) 
Color Temperature: 5600K 
Flash Duration: 1/200s - 1/20000s 
Flash adjustment: 8 levels of output control(1/1,1/2,1/4,1/8,1/16,1/32 ,1/64,1/128) 
57 levels of fine tuning 
External interface: hot shoe, PC port and eternal charging port 
Wireless triggering distance: 20~30m indoor, 10~15m outdoor. 
Additional features: The electronic flash head zooming, sound indicator 
Dimensions: 60X190X78mm
    

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