The RPS Studio Wireless Flash Trigger Kit will remotely trigger most electronic flashes or Speedlites. You can choose between 4 RF Radio Frequency channels to more reliably trigger your flash up to a distance of 85 ft. RF is more reliable than IR Infrared and less combersome than PC cords. The Trigger and Receiver are compatible with other RPS Studio RT03 RF units. The versatile Receiver has 2 hot shoes to accept 1 or 2 speedlites, a bounce control, unbrella holder, and a standard accessory foot with a 1/4-20 female thread to allow mounting on a light stand or accessory shoe. Additionally, there is a standard pc connection. Finally, this receiver will also accept standard photographic umbrellas.