This item has been discontinued and replaced by the 26322 and the 26323 The optical flash trigger mounts on the camera hot-shoe inside the housing and triggers the flashes via fiber optic bulkheads. Automatic TTL Flash is possible with Sea & Sea DS-TTL or Inon S-TTL Strobes. The TTL trigger also offers manual and rear curtain sync. Battery and charger are not included. This item is powered by the common Canon NB-13L battery, which is charged with the Canon CB-2LH Charger. Specification Construction: Body: PC+ABS Dimensions: Approx. 70 x 47 x 28mm Weight: Approx. 44g (w/ batteries installed) Battery: Canon NB-13L x1pc Operation: TTL or Manual Flash Capacity: Approx. 1000times Compatible housings: NA-1DXII, 1DX, 5DIV, 5DSR, 5DMKIII, 6D, 7DMKII, 80D, 70D Compatible strobes: INON: Z240 type 4, D2000 type 4, S2000 Sea&Sea: YS-D2, YS-D1, YS-01 Split Support & Downloads Instruction Manual