PowerST4Power Control for Elinchrom RX  The PowerST4 Receiver enables remote power control of Elinchrom RX flashes using PocketWizard ControlTL technology.  With a MiniTT1 Transmitter or FlexTT5 Transceiver on your camera and a PowerST4 plugged into your Elinchrom RX flash, you can now adjust the flash power