RoboSHOOT RX-20 ReceiverThe RX 20 Receiver from RoboSHOOT is designed for the current generation of Fujifilm X Series cameras and will trigger current X Series flashes (with the exception of the EF X8) when used with a separately purchased RoboSHOOT MX 20 transmitter. What makes the RX 20 remarkable is its i TTL compatibility. The RX 20 supports Nikon's SB 600, SB 700, SB 900, and SB 910 at distances up to 120'. Thanks to a free app (iOS 8. 3, Android 4. 0 or later) flash