FIFINE Bodypack Wireless Transmitter for K031B/K037/K037B/K038

There are a total of 4 versions of this bodypack transmitter. So please carefully choose the variants of when did you buy the FIFINE wireless system that you're using and whether the highest frequency of the transmitter that you will replace with is below 600MHz.  When you receive the correct transmitter, you still have to pair it with the FIFINE receiver that you have already been using. Find the model of yours and follow the tutorial video to pair the new transmitter with the old receiver. K031B from 3:10 to 4:00  K037/K037B from 2:02 to 2:42 K038 from 3:42 to 4:53