Yongnuo YN565EXC-USA E-TTL Speedlite Flash for Canon, GN58, US Warranty (Black) Acts as a wireless slave with full E-TTL for Canon"s wireless remote flash triggering system Multi mode for stroboscopic stop-action effects Automatic motorized zooming to match flash coverage area to the focal length of your lens Rear curtain sync for creative control of your subject"s light and motion blur Returns and service promptly performed in the USA for orders that are sold by and shipped from Amazon.com (must provide Amazon invoice copy for return authorization)