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. Uses the common Canon NB-13L Battery. Charge the NB-13L with Canon CB-2LH Charger.