Simple Studio (TM) NPT-04 4 Channel Wireless Hot Shoe Flash Trigger and 2 Receivers Set for Canon Nikon Pentax<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Includes (1) trigger， (2) receivers， (1) PC sync cord </span></li><li><span class="a-list-item"> 4 Control Channels， Frequency: 433MHZ </span></li><li><span class="a-list-item"> Up to 30ft range </span></li><li><span class="a-list-item"> Shutter Sync Speed: Up to 1/250th Second </span></li><li><span class="a-list-item"> Compatible with most flash units </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41%2BLQ3DnqHL.jpg" noproxy>