All "DR" and Solair constant color models are now available with 32 channel radio technology that wirelessly trigger your strobes. You can use multiple lights in the studio and on location and never worry about your lights being triggered by another photographer's flash. It's easy. Just set the radio PowerLightÂ© to one of 32 channels on the Pocket Wizard transmitter. The built inradio receiver never needs batteries. This model also includes a UV Color Corrected Flashtube (C4-15C).