Yongnuo YN-E3-RX YNE3-RX e-TTL Wireless Flash Receiver for YN600EX-RT YN-E3-RT With EACHSHOT&reg; Cleaning Cloth YN-E3-RX makes E-TTL flashes compatible with RT master flashes like 600EX-RT and commanders as ST-E3-RT and YN-E3-RT. Supports flash mode: E TTL, M, MULTI, High Speed Sync (HSS) Supports remote shutter release function, test flash