Yongnuo YN-E3-RT Flash Speedlite Transmitter for Canon 600EX-RT as ST-E3-RT<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"> Power Source: 2 AA/LR6 alkaline batteries Ni-MH batteries </span></li><li><span class="a-list-item"> Wireless flash shooting time: Approx. time: 10 continuous hours ** when using AA/LR6 alkaline batteries </span></li><li><span class="a-list-item"> Power saving: Power off after 5 min. of idel operation </span></li><li><span class="a-list-item"> Weight: Approx.110g(transmitter only， excluding batteries) </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41qBEHav6JL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41nJ6dKeA1L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41EwSeL2LpL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41KepFOFJeL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41sdcDPDJYL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51H3A4JJOAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41M95HjhcuL.jpg" noproxy>