This x2 ttl wireless flash trigger from godox is one that is dedicated to canon's e-ttl/e-ttl ii system and operates on a 2.4 ghz frequency. It can fire a single flash or multiple dedicated flash units within 5 groups, 32 channels, and 99 id settings to avoid interference from other nearby systems. For the added convenience, the integrated scan setting function can help you automatically locate an id channel with the least interference. You can also operate the flash units within a wireless range up to 328'.
Support ttl function
support for ttl flash,1/8000s high-speed-sync, flash exposure compensation, flash exposure lock, modeling flash, etc.
you can control the trigger by downloading "godoxphoto" app. After downloading the app, you can connect the trigger and cell phone by bluetooth.