The Broncolor RFS 2 Transmitter makes way for adding wireless functionality to your studio or work field by eliminating PC cords.The Broncolor RFS 2 Transmitter has 40 discrete channels for selection that helps in elimination of interference or overlap in multi-photographer eventsThe transmitter has an LCD screen that gives  information about channels, addresses, and power status of the systemThe Broncolor flash units  have power up/down buttons to control the output in 1/10 incrementsA single 3V CR2450 battery supplies power to the Broncolor radio slave.To facilitate battery-free operation, an optional USB power supply can be usedCompatible with all RFS series of monolights, the Broncolor RFS 2 transmitter is lightweight and easy to use