The adjustable voltage range can be really smooth and adjustable from 9V to 60V. Wide application: Suitable for DC motors up to 20A. Durable performance: Using high-quality and delicate metal shell, rust-free, safe and easy to use. High-quality circuit board ensures stable and durable performance. Easy To use: Easily control voltage and speed via the adjustable rotary knob. Description: This is a simple and easy to use DC motor speed controller with a minimal size, elegant appearance and stable performance. It is made with high quality circuit board which ensures longer service life. The input voltage can be between 9V and 60V, and the output voltage is between 0 and 100% of the input voltage. This speed controller is very convenient to use. Functionality és: The adjustable voltage range can be really smooth and adjustable from 9V to 60V. Wide application: Suitable for DC motors up to 20A. Durable performance: Using high-quality and delicate metal shell, rust-free, easy to operate and use. High-quality circuit board ensures stable and durable performance. Easy to use: Easily control tension and speed via the adjustable rotary knob. Specifications: Color: Silver Material: Metal Input voltage: DC 9-60V Output current: 0-20A Power: 1200W PWM frequency: 25KHz Adjustable speed range: 0-100% Speed adjustment way: Potentiometer Voltage of output: linear under load Efficiency:> 90% Size: approx. 92 x 52 x 36mm/3.6 x 2.0 x 1.4in Package weight: 132g Package List: 1 x Cruise Control