1.TTL Auto Flash - Xpro-S flash trigger supports TTL auto flash, 1/8000s high-speed sync, multiple flash, manual flash, flash exposure compensation, TCM shift function, magnification function, single and multiple shot settings, group modeling light control, group zoom, simultaneous adjustment of output values of all groups, etc. 2.Multi-Purpose - Built-in 2.4G wireless X system, allowing you to easily trigger and control the flash even from 100 meters away. Multi-purpose: as a wireless trigger for camera flash, outdoor flash and studio flash; as a wireless trigger compatible with Sony Speedlites triggers; as a wireless shutter release trigger; as a trigger for flash with 2.5mm sync cord jack (without X system) 3.TTL conversion manual function - long press the TCM button to convert the flash value in TTL mode to the power output value in M mode; short press the TCM button to switch single/multi-group mode 4.01-99 Wireless ID - the host and slave channels and wireless ID settings must be the same to trigger, effectively avoiding signal interference