Remotely trigger your flash or camera with this additional or spare RF-602RX Wireless Flash Receiverfrom Yongnuo for the RF-602 set. The receiver has a 1/4″-20 female mounting thread, a female hot shoe, and a proprietary locking output port for versatile connection and mounting. They function with a FSK 2.4 GHz frequency on one of 16 channels and have a far-reaching range of 328′. It can also sync at speeds up to 1/250 second and has dual-function shutter release with half-press and full-press capabilities. Also, it comes with a cable with a 3.5mm sync cable and a 6.35mm adapter for operation with a variety of strobes and studio lighting equipment. It runs on 2 AAA batteries.