Powerful operating system ensures that vehicle control, motor control and user-side programs run simultaneously. Advanced pulse width modulation technology ensures that the electricity is used efficiently and reduces the loss of motor energy consumption and torque conversion. Built-in electricity status and timer function. Items sent from UK warehouse. It may have a little delay during some holiday (such as Christmas), any problem, please feel free to contact. Always believe we can solve problems by communication if there are any problems. And if a return is the last solution, the product must be intact and the same as you receive, also should be within 30 days after you receive your package.