Small size, low heat generation, multiple protections; high efficiency, multiple speed regulation, large torque. Motor: within the rated speed, if there is no overload, the torque is basically unchanged. The motor can be adjusted forward and reverse for a long time without being affected. Small size, does not take up space. 4.450W-1000W motors have the same dimensions except for the length L. Reducer Ratio: 3/1,4/1,5/1,6/1, /10/1,20/1,30/1. 1x High voltage 80 brushless motor + 1x Reducer + 1x Controller. There are NO EXCEPTIONS! OR, you may choose to have a replacement. We will reply you ASAP. Our aim is to provide Top Level Customer Service, normally so we will try our best to solve any problem you have. Our customer-oriented service strives for. Business time: GMT8 (9:00-18:00) from Monday to Friday.