Wireless shutter: the receiver can control the camera via 3.5mm sync cord jack Zoom setting: Adjust the length of the flash through the transmitter TCM function: Converting the parameter under the TTL mode to a value under the Manual mode Firmware upgrade:support program firmware upgrade via Type C usb cable Memory function: As long as 2 seconds after setting parameters, the parameters will be remembered , and the original data will be recovered once restart. X2 Series TTL wireless flash trigger can work with camera flashes, outdoor flashes and studio flashes with built-in X wireless radio system. X2 achieves stable, reliable and effective real-time signal transmission which makes it a good choice for photographers who have lighting demands. Power supply:AA battery*2 Flash exposure control TTL Autoflash: E-TTL II Manual model: yes Multiflash mode:yes Functions: High-speed sync:yes Rear-curtain sync:yes Flash exposure compesation:yes, +/- stops in 1/3 stop increments Flash exposure lock:yes Focus assist:yes Modeling lamp:yes Beeper: yes Wireless flash: Transmission rage(.)0-100m Built-in wireless system: 2.4G Type: X2T-P ( Port) Colour: Black Material: metal + plastic Size: 7.2 x 7 x 5.8cm Package Contents: 1 x Wireless flash trigger Only the above package content, other products are not included. Note: Light 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.