Frankly, no need to use this product documentation (except the duty mofifier MhZ maybe ...). 1 button on the flash to be used (mode). 2 buttons on the controller (group and power of each "group" (1 group 1 flash). Excellent finish, perfect operation, conventional AA batteries. Received that day, I have made a test 3 'with 2 flash without having to move. Great.