After many requests for Punchlight products to be connected wirelessly. So they developed a simple solution to replace cables from their triggers : PunchLight Midi, GPI, DLi or Relay Switch Box USB, that go to external lights. The PunchLight Wireless Upgrade Kit consists of two small boxes. The first is a transmitter, connected to one of the trigger units via a 12V out. The second unit is a receiver, a small box which has one output and a connector for an external PSU. You can connect any of the PunchLight external lights to the receiver.