Eliminates the need for a cable release. Allows the camera to be fired from a distance up to 80 ft. uses RF (radio frequency) signals, not line-of-sight like infrared. Transmitter has a 2 position switch...press lightly for prefocusing, and then continue pressing to release the shutter. LED lights indicate prefocus and exposure. May be used on up to 16 channels...user settable.
Works for DSLRs: D3, D3s, D3x, D4, D200, D300, D300s, D700, D800, and D800E. .