Features: Undervoltage protection: When the battery voltages drops to controller's undervoltage value, it automatically stops output and protects the battery to prevent damage caused by over discharge of the battery pack. MOStube short circuit protection: Automatically detect MOStube faults when power on, preventing damage to other MOStube due to serials short circuit. Hightemperature protection: When the temperature of controllers itself is overtops, it automatically reduces the output current or stops output. Lock rotor protection: When the motor is lock, the control cap automatically limit the current. After 1.5s of lock rotor, the circuit is automatically cut offs to protect the motor and controller. Learning Line: When installing controllers, use a self-learning learning line, which can automatically completes the matching work between the motor and controllers, without the need for complex manual phase matching. Make installation easier. Specifications: Material: Aluminum alloy Size: As shown in the picture Working voltages: 36/48V Undervoltage protections: 19V/29V/39V Power: 350W Current limiting: 18±1A Current modes: constant current Motor angles: 60/120° Quiescent current: 22Ma Lock rotor protection: 1.5s Package Includes: 1x Brushless Motor Controller note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.