This product is a pwm controller, which is made of durable aluminum alloy material, with good texture, safe and practical. Easy to install and use, it can be easily applied to your equipment, a very practical accessory that will meet your needs well. Features -Color:Multi -Material:Aluminum alloy -Size:9.00X5.90X3.40cm/3.54X2.32X1.34in -Size:13.00X3.50X1.20cm/5.11X1.38X0.47in Note: Random style Applicable voltage range: DC 7-70V Drive current: up to 30A Control power: 12V within 300W, 24V within , 48V within 450W, 60V within 500W Duty cycle adjustable range: about 1%- PWM frequency: 12KHZ - Circuit optimization design: wide range of duty ratio adjustment, stable motor adjustment without noise and vibration, charge indicator, stable circuit design, precision welding , stable and long-term use. - Pulse width modulation with variable voltage input range, making full use of the energy of the power supply, and the circuit is efficient. - The maximum output current is 30A, which can provide enough driving capacity for the motor. - The parameters are accurate, not easy to generate heat, and easy to replace. Suitable for DC brushed motors. - Characterized by a sturdy and reliable texture, not easy to break, serving you for a long time. Package list: 4 controller 1 x fuse