Mcoplus DC1-S1 Wired Remote Shutter Release RM-S1AM Replacement for Sony Alpha A99, A77, A65, A58, A57, A350, A500, A550, A560, A580, A700, A850, A900, A55, SLT A57, SLT A37, SLT A55, SLT A65, SLT a77 Suitable for:Sony A100 A200 A350 A700 A900 & Minolta Dynax:7D/5D/9/7/5/4/3/807si/800si/700si/600si/505si Two stage release button: halfway pressing for auto focus, complete pressing takes the picture Support Wired Control Camera Shutter Lock the button for long exposures or continuous shooting No Battery Required-Powered by Camera