【Specification】Optional Style, 12V 400RPM, 12V 200RPM, 12V 130RPM, 12V 50RPM, 12V 30RPM, 12V 20RPM, 12V 12RPM, 12V 10RPM. 【31mm DC Motor】31mm high quality copper tube motor, small volume and big torsion, with micro-turbines worm, you can change the wiring-connection to change motor rotation. 【Quality Guarantee】Before leaving the factory, this product has been strictly supervised, built to meet standard specification, and strictly follow factory quality control, you can use it with confidence. 【Wear Resistant】Ball bearing design enhances the wear resistance of shaft, the metal gears are impact resistant, with long life and low noise. 【Wide Application】The worm gear motor is generally used in curtain machines, advertising equipment, window openers and smart devices, bank equipment, safe box, paper feeder, intelligent gas meter,.