White Lightning LG4X Four-Channel Wired Remote Control
The Four-Channel Wired Remote provides convenient, hand-held operation of up to four flash units. With individual, continuously variable slider control of flashpower over a 5 f-stop range (from Full down to 1/32 power), and common selection of Modeling Lamp mode to Full, Off, or Tracking, the LG4X remote control can easily operate up to four lights at distances of 100 feet or more without mis-fires. Running on standard 1.5 volt AA batteries, the unit connects to your lights using four color coded telephone cords, with a common sync connection to all lights.
The user manual can be found here.