Radio receiver 2.4 GHz E-TTL and HSSRemote trigger release case Function.Works on Cobra and studioDistance up to 100 m awayUpdate via USBGodox RF 2.4GHz radio systemRange  100 m +Flash modes: ETTL/M/offHSS to 1/8000thFEC/FEB  1/3rd increments ( 3 stops)Fel (Flash exposure lock)Manual flash  (1/128  1/1 output (1/3rd increments)Remote Flash ZoomGR Group Mode  A/B/C/D/E 5 groupsRatio group mode  a/b/c32 channelsLarge LCD displayBack light on-off switchHSS delay setting  0 ~ 19.9mS, 100us increments)Modeling FlashAuto memory functionAF Assist Light (Manual Open)Wireless Shutter ReleaseMicro USB port for firmware upgradesTransmitter PC sync port  Input & OutputReceiver 2.5 mm Sync and Shutter Release Port  Output