Bower SFD728S Digital Autofocus Flash for Sony A100/200/230/290/300/330/350/380/390/450/500/560/550/700/850/900 Digital SLR Cameras Auto power saving and check indicator Guide Number: 92 feet (50mm @ ISO 100).Fully Dedicated Digital Flash System. Compatible with all Sony Alpha models including: A100, A200, A230, A290, A300, A330, SLT-A33, A350, A380, A390, A450, A500, A560, SLT-A55, A550, A700, A850, and A900 28mm-85mm zoom coverage. NOTE:This item does NOT include batteries.