This series product is by the JB series miniature speed reducer gear, the electronic velometer, may the pro and con the integration of machinery product which is composed to the movement micro-motor three parts. Entire machine through to three major part different combinations, may obtain the different operational performance the product. Entire machine already may obtain arbitrary the fixed rotational speed by using the gear decelerator, also the passable electronic velometer has achieved the stepless speed regulation the goal. This series product because has decelerates the scope broadly, the strength can refer to the elevation, the easy to operate, the movement is reliable and so on the characteristic, but is widely applied to each kind of small light industry machinery, the packing, food, the spinning and weaving, puts on make-up (cosmetology) the machinery, the printing equipment, the instrument and each kind of automatic equipment, in the production assembly line