The FreeWave LR Wireless Flash Trigger Receiver from Vello is an additional receiver that will trigger off-camera flash units from up to 600' away. The 2.4 GHz frequency provides reduced radio interference and an extended range without the need for line-of-sight alignment as the radio waves will pass through some walls, windows, and floors. The receiver is compatible with most major manufacturers' shoe-mount flashes which offer manual power control. Pentax, Sony/Minolta, and Sony Multi-Interface Shoe flash units are not compatible.
Eight user-selectable channels allow you to control which flashes you want to fire, and LED indicators help you see the selected channel in difficult lighting.