Description: There are 2 versions of the 48V 750W (25A) controller ( old and new ). Suitable for: SF20/SK20/Kangaroo/SX20/SJ26/SF20H (non-UL)/SN100 (non-UL)/Reindeer (non-UL) are equipped with a speed sensor . If your e-bike is equipped with a torque sensor , it will not fit. Important Compatibility Note: Before purchasing, please double-check the connector type on your current controller to ensure you select the correct version for a perfect fit. This is a crucial step to avoid any installation issues. Note: The customization cycle for a 3-pin is about 2 weeks , and the shipping time is approximately 5-7 business days. The NEW controller has an additional blue plug, which is an open wire that goes to the taillight. If there is no taillight, then no connection is needed. All accessories are non-refundable and non-exchangeable.