X2T-O TTL wireless flash trigger works with camera flashes, outdoor flashes, and studio flashes with built-in X wireless radio system. It delivers stable, reliable real-time signal transmission Compatible photographers with varied lighting demands.Key features:- TTL capable operation Compatible accurate flash timing and power control within the X wireless radio system.- User-friendly design: LCD display with cleaeadout; 5 group buttons and 3 function buttons Compatible quick settings; all keys backlit Compatible easy operation in low light.- Bluetooth support: connect your smartphone or tablet (iOS or Android) via Bluetooth after installing the Photo app to control flash mode, power output, modeling light mode, and flash beeps.- Quick-lock hot-shoe; minimum power output settable to 1/256 in 1/10 step; 5 groups, 32 channels, and 99 wireless ID settings to limit interference from nearby systems.Use scenarios:- Studio portrait setup with multiple off-camera flashes Compatible balanced lighting.- Outdoor location shoots needing remote control of key, fill, and rim lights.- Event photography demanding reliable wireless triggering across several flashes.