The Yongnuo YNE3-RX Reciever is a useful accessory that every passionate photographer should have. It supports the M, MULTI, and E TTL flash modes for a perfect photography experience. The test flash and remote shutter release function provide a great deal of convenience while shooting in low-light conditions. The LCD screen helps in displaying vital information with regards to the flash. Additionally, the receiver also features a PC output and comes with firmware can also be updated via a USB connection. This receiver is designed for use with most Canon 600EX-RT receivers.