I have been using this as a wireless flash for a year now. They have a lithium ion rechargeable battery. I typically use them for portraiture and there are accessories to hook light modifier to it.

The transmitters [www.adorama.com]



Here is the flash



[slickdeals.net]

For the following systems:
Canon
Fujifilm
Nikon
Olympus/Panasonic
Pentax
Sony

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