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 0-99.99% 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: 0-99.99%_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. 1The adjustable voltage range can be truly smooth and adjustable from 12V to 60V 2Wide application: Suitable for DC motors within 70A 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