Yongnuo YN-622C Wireless TTL Flash Trigger Wireless Transceiver for Canon EXII Series Flash, 600EX (RT), Canon 5D Mark II, 5D Mark III System type: Digital FSK 2.4GHz wireless transceiver Compatible flash mode: E-TTL (II)/ Manual/ Multi Suit for camera Canon 5D Mark III & flash Canon 600EX (RT) Sync mode: 1st curtain, 2nd curtain, Hi-speed sync Support high-speed continuous shooting trigger