USB Fan Speed Controller — Simple, reliable control for 5V USB cooling What it does Three-speed adjustment with an integrated switch lets you select low, medium, or high fan speed quickly and reliably. Designed for USB-powered fans, the controller regulates power without requiring additional software or drivers. Rated for 5V, 3A input/output to match a wide range of USB cooling devices. Key benefits — why you need it Better comfort and quieter operation: Choose the fan speed that balances airflow and noise for your environment. Protects and extends fan use: Smooth speed control reduces abrupt starts and stops that can wear fans faster. Easy to use: Integrated switches give direct, instant control without reconnecting cables or changing settings on your device. Compatibility and performance Supports 5V, 3A USB fans; compatible with common 5V USB devices such as desk fans, laptop coolers, and 5V blowers. Works with most USB-A powered fans and USB power sources that supply 5V up to 3A. Provides reliable, stepped speed control across three settings for predictable performance. Practical features Plug-and-play operation: No installation required — connect the controller between your USB power source and the fan. Compact, portable design that fits easily on desks, near laptops, or in small workspaces. Durable switching for repeated daily use. Typical use scenarios Desk cooling: Lower noisy fan speed while working, then switch to higher airflow during intensive tasks or hot weather. Laptop cooling: Insert between a USB laptop cooler and power bank or USB port to reduce fan noise during light use and boost cooling when needed. Portable cooling for travel: Use with a 5V USB blower and a power bank to manage airflow and conserve battery life by selecting the appropriate speed. What’s included / how to use USB fan speed controller unit with integrated switch. Connect the controller inline between your USB power source and your 5V fan; toggle the switch to choose low, medium, or high. Compatibility reminder Designed specifically for 5V USB fans and rated up to 3A. Do not exceed the 5V/3A rating to avoid performance issues. This controller provides straightforward, reliable speed control for a wide range of USB cooling devices, making it a practical accessory for anyone using USB fans.