About this item : Compatible with BBS01B, BBS02B and BBSHD Drive System. All devices and parts are produced by OEM of BAFANG, reliable and in good compatibility. If you don't know how to assemble or disassemble, you could contact us and we would provide you with guidance. All controllers in this product link are New Version (With Light Connector & Gear Shift Sensor Connector If you are not sure about the controller version, feel free to contact us, please. Purchase Notes : Please check your own controller serial number on the motor before ordering. Do not buy if the serial number is different from our controller Do not change the different voltage and power controllers on the motor. For example, you ordered a 36V 250W motor, but you want to change the controller to 36V 350W or 48V 250W, etc. Please buy 36V 250W for your 36V 250W motor. Controller Current : New version with gear sensor and front light connector BBS01/BBS01B: C571-30-515 36V 500W BBS02/BB202B:C571-30-512 48V 750W BBSHD: C571-30-506 52V 1000W