The RX Hand Remote Control enormously increases the flexibility of all "RX" flash units. Optional remote cables up to 19.2 m, the integrated highly sensitive photocell and the 3.5 mm sync socket helps to control and trigger any RX flash unit at long distances. This item operates all functions of Style RX 300, 600 and 1200. Further the Hand Remote can be used for the Digital RX 1200/2400 and the Ranger RX battery powered system and operates almost all functions. (Slow charge and the head A or B selection for power packs is not available. Only the PC / Mac Software can operate all power pack functions).