"Easy to Use Extremely Reliable Basic Triggering Remote Power Adjustment 4 Groups, Stop Accurate 4 Memory Locations 1,500' Range Jr2 Transmitter If you are looking for a simple solution and don't need iTTL/ETTL or High Speed Sync, then the Jr2 System is the perfect way to trigger your off-camera flashes and studio strobes.The Transmitter simply attaches to your camera hot-shoe or via a cable through the PC Sync port. It provides incredibly simple controls that are easy to learn even for a beginner. Control 4 different groups of off camera lights, easily toggle your groups on and off and save your settings to 4 different memory locations. The Jr2 transmitter can also control any PX Receivers you have when used with a Canon setup. Jr2 Receiver The Jr2 Receiver is a great easy solution for triggering your off-camera flashes and studio strobes. Simply attach the Jr2 Receiver directly to your speedlight style flash or to your studio light via the included cables and you're ready to go. You can control the power output of your Alien Bees, White Lightning or Zeus Strobes, as well as almost any Canon or Nikon compatible speedlight including the Nikon 700 and 900 series flashes. The Jr2 Receiver provides stop accurate control for your lighting and may be assigned to one of 4 different lighting groups for maximum creative freedom"