EACHSHOT Shanny SN-E3-RTs Transmitter Flash Trigger for Canon 600EX-RT, Yongnuo YN600EX-RT, SN600C-RT Flash Speedlite As ST-E3-RT, YN-E3-RT Compatible camera: Compatible with E-TTL II/E-TTL Auto Flash A type EOS Camera Automatically Shanny speedlite signal transmitter SN-E3-RTs is a wireless strobe signal transmitter.