Specification: 36V 48V 22A Waterproof Controller for 500W E-bike Brushless Motor Descriptions: Controller dimension: about 12.5 * 6.6* 3.8cm weight: 350g 9 mosfets cable length :all about 10-13cm Maximum current: 221A Rated voltage:DC36V/48V Speed set:1-4.2V Rated current:11A Brake input :Low-Level Low voltage protection: DC30/400.5V Connectors: motor (9pin waterproof plug ) Power PAS (3pin waterproof plug) 1 to 4 cable(8 pins for throttle, e-bike, display) First of all, make sure that the outlet of your motor is 9 pin waterproof plug,and motor is brushless hub motor This controller can work with eletric bicyle only, not suitable for electric scooter. KT controller just only compatible with KT display(same communication protocol) . Please make sure that your system is KT system. 36V 48V 15A Waterproof Controller For 250W 350W E-bike Brushless Motor Descriptions: Controller dimension about 8.3 * 5.3 * 3.3 cm weight: 200g cable length :all about 10-13cm