This set includes PocketWizard PLUS II Transceivers that allow wireless radio triggering of up to 5 flash heads/units. The devices are compatible with PocketWizard and have a portable design, powered by AA batteries. Additionally, this set comes with 2x flash units and 1 camera flash sync. The trigger type is a wireless radio trigger that is perfect for remote and off-camera flash photography. The PocketWizard PLUS II Transceivers are in excellent condition and are sure to elevate your photographic experience.