The JJC TTL Off-Camera Shoe Cord FC-E3 mounts on CANON camera's hot shoe, the FC-E3's hot shoe mounts onto the flash bracket via the threaded insert and the flash mounts in the FC-E3's hot shoe. The FC-E3 maintains all of the on-camera functions (including E-TTL II) for one CANON Speedlite used off-camera at distance up to 140cm. All EOS cameras and EOS compatible flashes are compatible with the JJC Off-Camera Shoe Cord FC-E3 except the 630 and RT (which require a combination of TTL Hot Shot Adapter 3, OA-2 Off Camera Shoe Adapter & Connecting Cord 60). JJC FC-E3 compatible with CANON OC-E3. Weight: 92g Cord length: Expand approx. 140cm