Photoflex FlashFire, Battery Powered Wireless Trigger & Receiver Radio Slave Kit, 2.4GHz 16-Channel for StarFlash/ShoeMount Type Flashes 2.4 GHz band-16 selectable operating frequencies for eliminating interference The DC trigger transmitter/receiver pair may be used to trigger all studio flash units employing a standard 1/4 inch (6.3millimeters) phono jack for the Photoflex StarFlash 3.5 mm mini Jack sync adapter is provided for use with other major brands of studio strobes Sync cable features 3 pin thread lock connection to the receiver for secure connection Built in hot shoe for direct mounting of portable (shoe style) flash units