Godox x1t-s ttl 2. 4g hss 1/8000s wireless studio flash trigger for sony a77ii a7rii a7r a58 a99 features: godox ttl wireless flash trigger x1t-s applies to s0ny dslr cameras with mi shoe. Featuring multi-channel triggering with built-in 2. 4g wireless transmission fully support sony ttl functions, 1/8000s high-speed sync, second curtain sync, flashpensation, flash exposure lock, modeling flash control etc. With gr group flash and wireless grouping system (max 5 groups& 32 channels) and triggering the flash specification: model x1t-s type for sony cameras compatible cameras for sony eos cameras(e-ttl ii autoflash) support for the cameras that have pc sync socket built-in remote system 2. 4g wireless transmission modulation mode msk power supply 2 * aa (not included) exposure control manual flash yes ttl autoflash e-ttl ii ttl control hss yes fec yes(± stops in 1/3 stop increments) fel yes focus assis manual open second curtain sync no modeling flash yes(fired with camera' s depth-of-field preview button) wireless flash wireless function in ttl mode, ratio off in m mode, flash ratio(a: b c) support for gr group flash, a-e group can set their flash mode separately controllable slave group in the ratio grouping mode, 3(a/b/c) in the gr grouping mode, 5(a/b/c/d/e) in the ratio grouping mode, 3(a/b/c) transmission distance(max. ) about 100m channels 32 others sync delay set yes(0-10ms, use 100 as the unit) zoom setting adjust the flash' s focal length through the transmitter output interface use a pc cord to input and output firmware upgrade use the micro usb to upgrade memory function settings will be stored 2 second after last operation and recover after a restart item size 7. 5 * 7. 3 * 4. 5cm / 3. 0 * 2. 9 * 1. 8in package included: 1 x x1t s transmitter