The FK Irons Spektra Flux offers completely unrestricted movement through its completely wireless design. This lightweight, 4mm stroke direct drive rotary is ideal for both lining and shading, providing steady power output for up to 10 hours. Its simple 3-button user interface allows for quick voltage adjustments in increments of .5v. Pair an iOS or Android device to the Spektra Flux via Bluetooth to adjust voltage with voice commands, check session time, and install firmware updates through the DarkLab mobile app.