product is small in size, light weight, weight about: 3.80KG trangforter (1) High reliability; (2) Exclusive use of dual-rotor structure, with powerful drive and wider high efficiency platform; (3) Exclusive use of special new technology (high temperature resistance, high strength, high precision and large module), making the service life of the gears longer; (4) Dedicated maintenance-free lubrication system; (5) Honored with two national patents ZL 200620068535.3 ZL 200620068534.9