Additional receiver unit for the Hahnel Inspire Wireless Live View Remote Control for Canon DSLR's. Up to 4 DSLR's can be used with the addition of these extra receivers. Supported Cameras: Canon EOS 1100D, 1000D, 600D, 550D, 500D, 450D, 400D, 350D, 300D, 60D, EOS 50D, 40D, 30D, 20D, 20 Ds, 10D, 7D, 5D, 5D Mark II, 1D, 1 Ds Mark III & IV, Rebel T1i & T2i, Powershot G10, G11, G12 Pentax K-5, K-7, K10, K20, K100, K200, Samsung GX10, GX20,