This RadioPopper Radio Receiver for Photogenic Flash Heads plugs into the body of PowerLight and Solair series monolights except those with manual sliders, allowing triggering of the flash from distances up to 1,750'. The receiver works with virtually all RadioPopper systems and requires an optional Jr2, PX, JrX or Nano transmitter for use. In addition to remote triggering, the optional Jr2 transmitter is also capable of controlling Solair and PowerLight series power levels and modeling light functions. Settings are displayed on an LCD screen built into the receiver. Since it draws its power from the flash head, no batteries are needed.