USB Fan Speed Controller with Switch, Stepless 4

Compact USB Fan with Stepless Speed Controller Short description: This compact mini USB fan combines a quiet motor, low power consumption, and a stepless speed controller to deliver adjustable airflow for desks, travel, and small equipment cooling needs. Key benefits: - Flexible airflow control to match different needs, because the stepless controller provides a smooth output voltage range from DC 2.5-7.5 V for precise speed adjustment. - Broad compatibility with low-voltage DC sources, because the unit accepts DC 4-12 V input for use with common USB power banks, laptop USB ports, and 12 V adapters. - Quiet and efficient operation to reduce noise and conserve battery life, because the fan is designed for low current draw and consistent cooling performance up to its rated power. - Highly portable and easy to move, because the compact mini design keeps size and weight low for travel and desktop use. - Simple one-knob operation for convenience, because the rotary knob acts as both the stepless speed control and the on/off switch. Main features: - Stepless speed control produces a variable output voltage between DC 2.5 V and DC 7.5 V to allow gentle to powerful airflow. - Knob operation increases speed when turned clockwise and reduces speed when turned counterclockwise, and also functions as the power switch. - Compatible with fixed 5 V USB fans and two-gear fans; two-gear fans that include an internal boost board can be handled when the controller is used as directed. - Rated power is 5 W; do not overload the unit. - Compact mini form factor for easy transport and placement on desks or in small spaces. - Designed for low power consumption and efficient running for longer operating time. Technical specifications: - Input voltage: DC 4-12 V. - Output voltage: DC 2.5-7.5 V. - Rated power: 5 W (do not overload). - Control method: rotary stepless voltage regulator and integrated power switch. Usage notes: - When using a two-gear fan, set the fan first to single-speed mode before switching the controller to the two-gear setting to avoid adjustment failure. - Operate the controller only within the specified input voltage range (DC 4-12 V) to ensure reliable performance. Practical applications: - Personal desk cooling powered by a laptop USB port or portable power bank for comfortable workspace conditions. - In-vehicle use when connected through a compatible 12 V adapter to improve airflow in small areas. - Small electronics or DIY projects where adjustable, quiet airflow is needed for component cooling or ventilation. Package contents: - One DC 4-12 V, 5 W mini USB fan with stepless speed controller, airflow regulator, and quiet adjustable multi-speed module. This product delivers adjustable and quiet airflow in a compact and energy efficient package for versatile low-voltage cooling needs.