Professional Kit includes two PerfectCue systems (PC-433BP-SYS) and carrying/storage case. This is an ideal solution for A-V staging company that is doing setups in large halls. One cue light can be placed on stage near speaker to receive RF signal from transmitter. Other cue light at back of auditorium near projectionist is connected by CAT-5 or XLR cable. Only one cue light needs power. For smaller venues, each system can be used separately. Cue light and hand-held transmitter can communicate over 16 selectable channels so that the systems can operate in adjacent rooms.