The Elinchrom D-Lite RX One Flash Head is a 100W/s auto-sensing, multi-voltage monolight that recognizes any AC power source from 90-260VAC, allowing power variability over 5.0 stops in 1/10 stop increments. Recycling is a fast 0.5-2.1 sec. (@115V) with flash durations as short as an action-stopping 1/1,100 sec at full power. Although this head accepts a PC cord, it also has a built-in EL-Skyport Receiver with eight frequency channels that can handle four distinct groups of flashes. Separate purchase of the EL Skyport Speed Transmitter allows you to trigger your flash at distances up to 393 and gives you control of power on/off, modeling light functions and Speed Sync activation. Free software for Mac and PC computers is also available, providing additional features such as Flash-Delay for strobing effects. Add an optional Wi-Fi module to the transmitter to use with apps that allow full remote control via your iPhone, iPad or iPod Touch. The D-Lite RX Ones bayonet mount accepts all Elinchrom accessories and softboxes up to 135 cm.