ProMaster Single Flash and Remote Camera Trigger System V2 &lt;p&gt;The ultimate remote tool, the ProMaster Remote Camera and Flash Trigger System works as a wireless remote trigger for your on camera or studio flash OR it can be used as a wireless remote shutter release for your camera &amp;#40;optional modular cord required&amp;#41;.&lt;/p&gt; &lt;p&gt;These units operate on the 2.4GHZ frequency, providing for extended distance and much higher reliability than older systems. With the dual functionality, the ProMaster Remote Camera and Flash Trigger System is a must have acces