Products Package Includes: 1 x Signal Transmitter, 1 x Synchronous Wire Cable, 1 x User Manual, 1 x Package Bag. A flash signal transmitter can significantly improve the efficiency for your outdoor shooting. Do you need one to enjoy the convenience or as a replacement for your worn-out one? Come and have a look at this YN-E3-RT 15 Channel On-Camera Flash Signal Transmitter Black! With delicate design it suits well for mainstream cameras including Canon, and is lightweight to ensure portability. To improve the practicability of outdoor use, it is water-proof and shock-proof. Made with superior material, it is sensitive and accurate with a long service life. What a perfect helper for your shooting! You should not miss it! 9 kinds of customer functions for your customized choice. Easy to install and apply to use. Supportive for full-automatic function for your convenience. Remote control distance farer than 100 meters. High-tech components to ensure stable performance. Superior quality and long service life.