This is a simple and easy-to-use DC motor speed controller with mini size, elegant appearance and stable performance. It is made with high quality circuit board which ensures a longer service life. The input voltage can be DC 12V to 60V and output voltage is 0-100% of the input voltage. This speed controller is quite convenient to use. Features: The adjustable voltage range can be truly smooth and adjustable from 12V to 60V. Wide application: Suitable for DC motors within 70A. Durable Performance: Using high quality and delicate metal shell, no rust, safe and convenient to use. High quality circuit board ensures stable and durable performance. Easy to use: Easily control voltage and speed via the adjustable rotary knob. Specifications: Model: PWM 70A-220S Color: Silver Material: Metal Input Voltage: DC 12-60V Output Current: 0-70A Power: 4000W Rated Current: 70A Speed Adjustment Type: Current Adjust Adjustable Speed Range: 0-100% Speed Adjustment Way: Potentiometer (linear) Output Voltage: Linear under load Over current Protection: 80A Red Wire: "+" Black Wire: "-" Panel Cutout Diameter: 10mm / 0.4inch Size: Approx. 150*85*45mm/5.9*3.3*1.8inch Weight: Approx. 586g / 20.7oz Package List: 1 x Speed Controller Note: 1. This DC motor controller input is connected to direct current, CANNOT be connected to alternating current, or it will be burnt. 2. Make sure the positive and negative polarity is connected correctly, otherwise the controller will be damaged. 3. Please allow small size error due to manual measurement. Thanks for your understanding.