Main Features:• Built-in 2.4G Wireless TransmissionBuilt-in 2.4G wireless transmission provides 100 further transmission distance and creative triggering methods.• Fully Supporting TTL FunctionsSupport for TTL autoflash, manual flash, multi flash, 1/8000s HSS, flash exposure compensation, flash exposure lock, modeling flash, etc.• Wireless Remote Control and Grouping SystemWith GR group flash and wireless grouping system (max. 5 groups & 32 channels) and triggering the flash.• Big and Clear LCD PanelTransmitter and receiver both have backlight LCD panel to offer convenient operation.• More FunctionsVersatile functions such as synchronization delay setting, wireless shutter release, zoom setting, etc.PC sync socket to input and output; receiver use 2.5mm sync cable to output.USB firmware upgrades helps keep pace with the latest technology.Useful memory function that settings will be stored 2 seconds after the last operation and recover after a restart.