Easy to Use & Versatile Control: Simply turn the knob clockwise to increase the air volume or counterclockwise to reduce it. The knob also functions as a switch, allowing you to easily turn the fan on or off. Suited for fine-tuning airflow in any environment. Hard-wearing & Lightweight Design: Crafted from high-quality aluminum, this fan speed controller is both lightweight and hard-wearing, ensuring a long service life. Its robust construction makes it ideal for daily use in offices, homes, or on the go. Precise & Wide Voltage Range: Enjoy precise control with a stepless governor that offers an adjustable output voltage range from 2.5V to 8.0V. This wider range allows you to set the air volume exactly as you need it, providing optimal comfort. Compatible With Multiple Power Sources: This USB fan regulator is compatible with various power sources, including computers, power banks, and other USB-enabled devices. It’s an excellent match for use with common 5V USB fans available in the market. Portable & Energy-Efficient: With a compact design and low power consumption (rated at 5W), this fan speed controller is highly portable and energy-efficient. It’s an excellent choice for those who need adjustable airflow while conserving energy., Manufacturer: Walfront