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._x000D_ _x000D_ Features:_x000D_ _x000D_ The adjustable voltage range can be truly smooth and adjustable from 12V to 60V. _x000D_ Wide application: Suitable for DC motors within 70A. _x000D_ Durable Performance: Using high quality and delicate metal shell, no rust, safe and convenient to use. _x000D_ High quality circuit board ensures stable and durable performance. _x000D_ Easy to use: Easily control voltage and speed via the adjustable rotary knob. _x000D_ _x000D_ Specifications:_x000D_ Model: PWM 70A-220S _x000D_ Color: Silver_x000D_ Material: Metal_x000D_ Input Voltage: DC 12-60V_x000D_ Output Current: 0-70A_x000D_ Power: 4000W_x000D_ Rated Current: 70A_x000D_ Speed Adjustment Type: Current Adjust_x000D_ Adjustable Speed Range: 0-100%_x000D_ Speed Adjustment Way: Potentiometer (linear)_x000D_ Output Voltage: Linear under load_x000D_ Over current Protection: 80A_x000D_ Red Wire: "+"_x000D_ Black Wire: "-"_x000D_ Panel Cutout Diameter: 10mm / 0.4inch_x000D_ _x000D_ Size: Approx. 150*85*45mm/5.9*3.3*1.8inch _x000D_ Weight: Approx. 586g / 20.7oz _x000D_ _x000D_ _x000D_ Package List:_x000D_ 1 x Speed Controller_x000D_ _x000D_ Note:_x000D_ 1. This DC motor controller input is connected to direct current, CANNOT be connected to alternating current, or it will be burnt._x000D_ _x000D_ 2. Make sure the positive and negative polarity is connected correctly, otherwise the controller will be damaged. _x000D_ 3. Please allow small size error due to manual measurement. Thanks for your understanding.