[Widely Compatible]Compatible with all / EXII series flashes. [Support PC port and HSS function] Support PC port to trigger strobe, support first and second curtain/HSS(Super Sync). [Support USB firmware upgrade] -622C-TX adopts LCD display, multi-button quick operation, and the firmware can be upgraded through the USB interface. [Support remote control mode and master control mode] Support remote setting of flash parameters(remote control mode)through the transceiver. Support mixed use of E-TTL/manual/repeating flash mode. Support flash installed on the transmitter(on-camera flash), support i-TTL function. Support to use the host to set each group of parameters for the transmitter(Master Control Mode). Support FEC, FVL function. Modeling flash and reduction flash are supported. Support flash zoom(automatic) Specifications: System type: Digital 2.4GHz wireless transceiver Distance: 100m Channel: 7 Flash mode: E-TTL(II), Manual flash, Multi flash Sync mode: 1st curtain, 2nd curtain, Hi-speed sync Firmware upgrade terminal: -USB Applicalbe battery: 2 x AA(support 1.2v rechargeable battery,Does not contain) Stand-by time: 60h Dimensions: 91.5 x 53.5 x 43mm Net weight: 89g Material: plastic colour: black Package Contents: 1 x Transmitter 1 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.