Opteka EF-710 DG Super TTL Autofocus Dedicated Flash for Olympus and Panasonic Digital SLR Cameras Works on all Olympus and Panasonic Digital SLR Cameras Bounce capabilities in 5 steps up to 90 degrees; flash shooting distance range from 2 and up to 72 feet 35mm angle of coverage with Olympus and Panasonic digital SLR cameras Guide number (ISO100) 22(m)/72(ft) at 35mm Advanced 2nd generation flash technology, only compatible with rechargeable AA batteries (Lithium, Ni-cd & Ni-MH)