SFBAY Pro Remote Shutter Release Connection Cable Compatible with RM-S1AM Replacement Commander for Sony Alpha DSLR A900 / A850 / A800 / A700/ A560 / A550 / A500 / A450 / A400 / A350 / A300 / A200 / A99 / A77 / A65 / A57 / A55 / A37 / A33 100% Compatible with RM-S1AM Shutter Release. No batteries are required Great for studio, Night shooting, and Long time explosure Use for Continuous or Single Exposures User Manual Included