E3+ Transmitter can be used for wireless flash shooting, which is compatible with original Canon radio system and well worked with Canon 600EX-RT and 600EX II-RT, 430EXIII. It can control up to 5 groups(15units) of Canon speedlites that have a wireless multiple flash shooting function using radio transmission, as well as non-wireless Canon ETTL Speedlite by using E3+ receiver. Compatible camera:10D, 30D, 40D, 60D, 70D, 80D, 100D, 400D, Kiss X2, Kiss X3, 550D, 600D, 700D, 750D, 760D, 1100D, 1200D, 1300D, 5D, 5DII, 5DIII, 5Ds, 5DIV, 6D, 7DII, 1DII, 1DIIN, 1DIII, 1DIV, 1DsII, 1DsIII, 1DX, G1XII, G12, EOS M , EOS M2, EOS M3, 20D, 300D, 350D, 500Dm 650D, 1000D, G1X, G6Technical Specifications: Frequency: 2405~2475Hz Channel: Auto, Ch.1~15 Wireless radio ID: 0000~9999 Slave unit control: Up to 5 groups (A/B/C/D/E), up to 15 units Transmission distance: 100m+ Flash ratio control (Tx): 1:8~1:1~8:1, 1/2-stop increments Flash exposure compensation (Tx): ±3 stops in 1/3- or 1/2- stop increments