Moving anafi by the move by command

i use moveby command to control my actual anafi drone when i type moveby(10, 0, 0, 0) it moves ok but when i type moveby(5, 0, 0, 0) it doesnt work i dont know why(i use wait command).
and a nother thing when we type (5, 0, 0, 0) 5 is the meter to go or the velocity ?