The Pixel FC-311/M TTL cord is about 70cm when coiled and the cable itself is about 3.6m long (Theoretical cord length). The operating length is about 2m. The UNC (Unified National Coarse Thread) of tripod socket is 1/4 inch. Make sure you install the cable correctly (please refer to product pictures or user manual). It"s compatible with all Canon Speedlites and all other branded Canon fit flash units, including 220EX, 300EZ, 380EX, 420EZ, 420EX, 430EZ, 430EX, 430EX II, 480EG, 540EZ, 550EX, 580EX, 580EX II. It can be mounted on any Canon auto focus 35mm film or Canon Digital SLR camera, including EOS 1D, 1DC, 1DX, 1Ds, 1D Mark III, 1D Mark IV, 1D Mark II, 1Ds Mark II, IDs Mark III, 40D, 50D, 5D, 5D Mark II, 5D Mark III, 6D, 7D, 10D, 20D, 30D, D30, D60, Kodak DSC-530, Canon EOS 1000D, 1100D, 450D, 500D, 550D, 600D, 60D, 60Da, 650D, 400D, 350D, 300D, Canon Kiss F Digital, X2, X3, X4, X5, X50, X6, Canon PowerShot G1X, G10, G11, G12, G15, Canon Rebel T1i, T2i, T3, T3i, T4i, XS, Xsi, Hasselblad H4D-200MS, H4D-31, H4D-40, H4D-50, H4D-50MS, H4D-60... Pentax 645D, K-30, K-5, K-7, K-m, K100D Super, K200D, K20D, Contax, Samsung GX-20, NX-10, NX-100, NX-11, NX-5. . Package list: Pixel FC-311/M-3.6M cable * 1 pcs Manual instruction * 1pcs Please Note: Accessory Only. The Camera and Speedlite in the pictures are only for demonstration use only, they are not included in the package!!