Sony RM-S1AM Remote Commander for Sony Alpha Digital SLR Camera Allows you to release the camera's shutter without touching the camera body Eliminates camera shake caused by hands Useful when shooting with the Bulb (B) setting, at night, in low-light situations, or with a tripod Features a shutter-lock function, to prevent camera misfires Cable length: 19 3/4 inches (0.5 meter)