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: SilverMaterial: MetalInput Voltage: DC 12-60VOutput Current: 0-70APower: 4000WRated Current: 70ASpeed Adjustment Type: Current AdjustAdjustable Speed Range: 0-100%Speed Adjustment Way: Potentiometer (linear)Output Voltage: Linear under loadOver current Protection: 80ARed Wire: "+"Black Wire: "-"Panel Cutout Diameter: 10mm / 0.4inchSize: Approx. 150*85*45mm/5.9*3.3*1.8inchWeight: Approx. 586g / 20.7ozPackage List:1 x Speed ControllerNote: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.