Check the listing for details. PocketWizard ST4 Power Receiver for Elinchrom RX Flash Units (Black). Condition: New. Listed at 110.00 USD. Overview Using the PocketWizard PowerST4 Receiver for Elinchrom RX can give you near-total remote control over all your Elinchrom RX strobes--with either the MiniTT1 Transmitter or FlexTT5 Transceiver (both optional, use of one is required) on your camera and a PowerST4 plugged into your Elinchrom RX flash, you can now change flash power settings directly from your camera position. Use the PowerTracking function and when you change ISO or aperture, the lights automatically adjust their power setting. By adding the optional AC3 ZoneController, you can control three different zones of lights in 1/3-stop increments with up to a six-stop range. HyperSync gives you the ability to sync at up to 1/8000s at full power (depending on your flash and camera). Total control (over your lights, anyway) is yours! Important Information: Units sold in USA use 344.0 MHz for channels 1-16, and 346.5-354.0 MHz for channels 17-32 • Units sold in Europe use 433.62 MHz for channels 1-16, and 434.22 for channels 17-32 • USA and Euro models cannot converse with each other • USA models may interfere with devices in Europe. This item is FCC compliant and can only be used with corresponding USA FCC compliant models. Using this item outside of the United States may be illegal. Key Features Compatible with FCC Compliant Items Only Adjust Settings From Camera Position Auto or Manual ISO & Aperture Control Up to 20 ControlTL Channels Possible Compatible With Any PocketWizard Radio Plug Into Elinchrom Flash Remote Socket Programmable and Upgradeable No Batteries Required HyperSync Up to 1/8000s Possible MiniTT1 Trans or FlexTT5 Trans Required In the Box PocketWizard ST4 Power Receiver for Elinchrom RX Flash Units (Black) Quick Guide Limited 2-Year Warranty Not in the Box Transmitters (Not Included)