How does this thing really works?http://cgi.ebay.co.uk/8x-Flash-RF-604-Transmitter-PT-04-Receiver-CR2-Battery_W0QQitemZ350084772471QQcmdZViewItem?hash=item350084772471&_trkparms=72%3A984%7C39%3A1%7C66%3A2%7C65%3A12&_trksid=p3286.c0.m14.l1318#ebayphotohosting
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