USB Fan Speed Controller 5V Stepless Plug and Play with One-Knob Control

USB Fan Speed Controller with Silent On Off Knob Control fan airflow precisely and quietly for office, dormitory, bedside, or personal cooling. Why you need it - Adjust fan speed smoothly to match your comfort needs and reduce noise when lower airflow is acceptable. - Makes fixed speed USB fans usable in more situations by providing stepless control between low and high output. - Simple USB power connection works with common phone chargers, power banks, and computer USB ports for flexible placement. Key features and benefits - Stepless speed control: output voltage adjusts smoothly from 2.5 V to 8.0 V so you can fine tune airflow without abrupt jumps. - Wide input range: accepts DC 4 to 12 V power sources, suitable for most USB and USB type power supplies. - Rated power: 5 W. Do not exceed this power rating to avoid overloading the controller. - Built in on off knob: rotate clockwise to increase airflow and counterclockwise to reduce airflow. The knob also functions as the power switch for easy operation. - Two stage fan compatibility: supports common 5.0 V USB fans. For two stage fans with an internal step up board, place the fan into a single gear before using the controller to ensure speed can be adjusted. - Boost function for two stage fans: when a two stage fan is set to its second gear, the internal boost board raises motor voltage to 5 V via USB for higher airflow. How to use - Plug the controller male USB plug into a phone charger, power bank, or computer USB port. - Connect your USB fan into the controller output socket. - Turn the knob clockwise to power on and increase speed, or counterclockwise to reduce speed and power off. - Alternatively, use a Micro USB 5.0 V adapter as the power source when needed. Compatibility and performance - Designed for common 5.0 V USB fans and similar DC fans within the input voltage range. - Output range of 2.5 V to 8.0 V offers a larger adjustment window than many basic controllers. - Rated for up to 5 W of power handling; suitable for most small USB fans but avoid connecting higher power fans. Important note - For fans that have two factory speed stages, set the fan to a single gear before attempting to adjust speed with this controller, otherwise speed adjustment may not take effect. Practical applications - Office desk: Reduce fan noise while maintaining comfortable airflow during focused work. - Dormitory or bedroom: Lower night time fan speed for quieter sleep while still getting cooling near the bed. - Portable personal cooling: Use with a power bank for adjustable airflow outdoors or while traveling. This controller provides a compact and straightforward way to tailor USB fan airflow and noise to your needs while maintaining simple USB power compatibility.