Transceiver System - works as a wireless flash trigger and receiver FSK 2.4GHz wireless control Remote shutter cord function Sync flash trigger Compatible with: Canon EOS 5DII, 5D, 7D, 50D, 40D, 30D, 20D, 10D, EOS1V, EOS3, EOS1D, 1DS, 1DSMK II, 1DSMK III, EOSD30, EOS 10D, 20D, 30D, 40D, 50D, 5D, 5D II, 7D, EOSD60 Best replacement of Canon RS-80N3