Motorized cassette has been added a function that it can be operated with electric based on manual cassette.It has the same size with manualcassette.In order to achieve intelligent,progammatic and remote control,it is a necessary component.Over the years motorized cassette has developed to the fourth-generation mixed type from the first-generation.It can match with micro permanent-magnet DC machine since the third generation.Furthermore,making full use of space, motorized cradle will not change the size and the function after matched with micro permanent-magnet DC machine.If you want to purchase motorized cassette,please add DD3 or DD4 after code when ordering.