1The adjustable voltage range can be truly smooth and adjustable from 9V to 60V. 2Wide application: Suitable for DC motors within 20A. 3Durable Performance: Using high quality and delicate metal shell, no rust, safe and convenient to use. 4High quality circuit board ensures stable and durable performance. 5Easy to use: Easily control voltage and speed via the adjustable rotary knob.Description: This is a simple and easy-to-use DC motorspeed controller with mini size, elegant appearance and stable performance. Itis made with high quality circuit board which ensures alonger service life. The input voltage can be DC 9V to 60V and output voltageis 0-100% of the input voltage. This speed controller is quite convenient touse. Features:The adjustable voltage range can be trulysmooth and adjustable from 9V to 60V. Wide application: Suitable for DC motorswithin 20A. Durable Performance: Using high quality anddelicate metal shell, no rust, safe and convenient to use. High quality circuit board ensures stableand durable performance. Easy to use: Easily control voltage andspeed via the adjustable rotary knob. Specifications: Color: Silver Material: Metal Input Voltage: DC 9-60V Output Current: 0-20A Power: 1200W PWM Frequency: 25 KHz Adjustable Speed Range: 0-100% Speed Adjustment Way: Potentiometer Output Voltage: Linear under load Efficiency: > 90% Size: Approx. 92 x 52 x 36mm / 3.6 x 2.0 x1.4in Package Weight: 132g Package List: 1 x Speed Controller Note:This DC motor controller input is connectedto direct current, CANNOT be connected to alternating current, o