I bought that servo to realize the progect automatized drawing board but for the mouth movement is pretty impossible to record a correct speed for a fast talking or a song sung by the board, no problem for the eyes but for the mouth even if I have utilize the power supply from a different battery pack that do not charge the servo controller of to much work is pretty impossible , the motion recorder controll let very difficolt to record a fast move of the mouth completely open because you have to rotate the whell completely and come back... is not so easy