Sekonic Corporation RT-32CTL Radio Transmitter Module, (Black) RT-32CTL simultaneously triggers Standard Channels (32 channels, 4 zones) and ControlTL Channels (20 channels, 3 zones) Meters equipped with the RT-32CTL can trigger PocketWizard FlexTT5 and measure power levels of Canon or Nikon speedlights set by a PocketWizard AC3 ZoneController mounted on PocketWizard MiniTT1 or FlexTT5 transmitter The RT-32CTL is designed for the Sekonic L-358 FlashMaster, L-758DR and L-758 Cine. It is also operates with earlier transmitter-compatible Sekonic meters