Canon LC5 Wireless Controller to suit EOS 1D III/1DsII/1Ds/1DIIN/1DII/3/5D/5D MKII/10D/20D/30D/40D/50D/7D. Maximum signal distance is approximate 100m. The Wireless Controller LC-5 is also equipped with three channel settings (A, B and C) to ensure that multiple remote Canon users do not inadvertently set off someone else's camera or in situations where a single photographer is remotely triggering more than one camera set-up.