The present invention relates to a control module for a mobile unit, the control module comprising a plurality of user operable control members and a multiplexing unit. The reel-type cuff is elastically and recoverably reeled in the base with one end, and is freely extended out from the base with the other end. The side face of the right frustum forms a taper angle larger than 0\xb0 and less than 15\xb0 with the central axial line of the right frustum, and an aspect ratio which is a proportion of the height of the right frustum to the minimum length of the cut surface of the right frustum is larger than 0, and no more than 10. The drive connection is established when the motor rotates in a first direction and the advance assembly conveys the band in the direction of the baling chamber.