Specification:
Item Type: Wireless Flash Trigger
Material: ABS Model: VC-818TX
Weight approximately. 123g
Color: as shown in the picture
Exposure control system: E-TTL II / E-TTL automatic flash light, manual flash light, frequency flash light
Channels: 8 channels (1-8), 30 ID
Groups: each channel independently controls 3 groups of flash light (ABC)
Transmission distance: effective trigger about 25 meters
Exposure Compensation Control (FEC): ± 3 steps in 1/3 increments
Flash Surround Exposure: ± 3 steps in 1/3 increments
Exposure Lock: Yes
Maximum synchronization speed: up to 1/8000s
Manual flash: power from 1/1 to 1/128 (increments of 1/3 EV)
Strobe flash: up to 20 flashes / up to 30 Hz frequency
Auxiliary focus function: has
USB firmware update: has
Power supply: 2 x AA alkaline batteries or NI-MH battery (not included)
Size: Approx. 90x56x40mm / 3.5x2.2x1.6 inches Compatible Camera: For Canon 450D / 600D / 700D / 750D / 800D / 5D2 / 5D3 / 5D4 / 5DS / 6D / 6D2 / 7D / 7D2 / 70D / 80D / 1D3 / 1D4 / 1DX.

Package List:
1 x Wireless Flash Trigger 1 x instruction