Professional hot shoe flash trigger, FSK 2.4GHz frequency, stable and wide receiving range; Multiple channels setting to prevent interference; Can be as a trigger studio flash, camera flash, RM II umbrella hole and angle rotational stand; Effectively ensure transmission speed, distance up to 100m; Sync speed up to 1/250s; With lead flashing light function; Simple 4 set of channels designed; Hot shoe fixed ring, more easier installation.