Specification: Color: silver material: aluminum shell size: as shown in the figure voltage: 48v60v64v power: 1500W limit: 18 tube single row: features and advantages: ultra quiet function: Aiming at the disadvantage of ripple current of brushless motor, the noise and vibration during startup are minimized. soft start: safe start, increase the starting torque and make the start more stable. the anti flight function solves the flight phenomenon caused by poor speed regulation or line fault.At the same time, the anti flight function is activated, which improves the safety of the system. anti theft function: the purpose of anti-theft is to use the external alarm first, and the motor will automatically lock in case of anti-theft. complete power-off function. When the electric door lock is closed, the controller will automatically turn off the power to reduce misoperation and greatly improve the safety performance.Note: 1.Please allow an error of 1-3mm due to manual measurement.Please make sure you don't mind before you bid.2. Due to different display, the color may be different. Please understand.Package content: 1 x electric bicycle reversing