mains power remains connected to the lamphead. The ventilation continues, cooling the unit. Additional cables of 1.2 m or 2.4 m may be connected enabling control of all these functions at distance or simply to use as a remote slave cell. Tracking systems and remote booms are typical applications. The remote control enormously increases the flexibility of Style S units.This unit is ideal for the existing tens of thousands of studio photographers world wide who may wish to increase or update their flash units at very modest cost.This product is designed for Elinchrom Style 300 S/600 S/1200 S flashheads.For a complete compatibility list please refer to the original manufacturer's web site.  (less)