NEEWER&reg; Wireless Shutter Release IR Remote Control for Sony Alpha A230, A330, A450, A500, A550, A700, A900 Digital Cameras RMT-DSR1 Shutter Release remote for Sony a230 a330 Quantity: 1. Can trigger the camera shutter release remotely from a distance. Wireless System:IR(Infrared). Compatible With : Sony Alpha A700, A900, DSLR-A230, DSLR-A330.