A speed controller is a device used to control the output speed of an electric motor or engine. It can adjust the speed of the driving device according to system requirements, thereby achieving precise control of mechanical equipment. The principle of a speed controller is based on the control of an electric motor or engine, which adjusts input voltage, current, or frequency parameters to achieve the adjustment of output speed.
1.Our ServicesGuarantee:365 days after selled.
2.During guarantee,the items share free repairs or replacement.
3.Customer is responsible for the freightcome-and-go, and the custom tax.
4.You may consider to send the defective item with a economica way and we send back the repaired items with your new order together.
5.To save the cost,pls send the item back without packing.
6.Pls provide the defective appearance and related invoice number.
7.We do not repair or replace item with an expired warranty.
8. All emails will be answered within 1 business day. If you do not receive our reply, please kindly re-sent your email or give us a call any time.
We are expecting the long time and mutual benefit cooperation with you!
