[Wide Voltage]: Wide voltage input 7-70V, maximum output current 30A. Recommended power range: 12V within 250W, 24V within 350W, 48V within 450W, and 60V within 500W. [Speed Control Knob]: The knob includes a switch function to control motor speed from 0% to 100%. Adjustable potentiometer with flexible cable, detachable design. Cable length: 15cm. [30A Fuse]: Includes a 30A fuse to protect against short circuits. Provides double protection for your motor and motor speed controller. [Note 1]: Input power supply must be 1.5 times the rated power of the motor for proper operation. Input voltage must match the motor's rated voltage. [Note 2]: If used with a children's car that has a forward-reverse circuit regulator, connect the speed controller between the power supply and the forward-reverse circuit regulator. Failure to do so may damage the controller. Precautions: This module is a DC motor speed controller and must not be connected to AC power. Input power supply must be 1.5 times the motor’s rated power. Input voltage must match the motor’s rated voltage. For Children's Car Use: The output end of the speed controller can be connected to a forward and reverse switch to enable forward and reverse control. If the children's car has a forward-reverse circuit regulator, connect the speed controller between the power supply and the regulator to prevent damage. Specification: DC Motor Speed Controller Voltage Range: DC 7-70V Drive Current: Max 30A (Refer to recommended control power for actual usage) Recommended Control Power: 12V: up to 250W 24V: up to 350W 48V: up to 450W 60V: up to 500W Duty Cycle Adjustment Range: Approx. 1% - 100% PWM Frequency: 12KHz Fuse Rating: 30A max Wire Specifications: 2.5mm² / 0.4cm diameter / 12AWG Wire Length: 26cm (total length including connector 30cm) Material: ABS Color: As shown Package Contents: 1 x DC Motor Speed Controller Note: Light and display differences may cause slight color variation between image and actual item. Measurement error allowed is +/- 1-3cm.