Specification: Working principle: Wind turns the paddle on the generator shaft. Once a certain rotational speed is reached, the motor begins generating electricity. The higher the wind speed, the greater the output voltage. Note that natural wind may not provide sufficient force; typically, the airflow from a hair dryer or similar source is required to achieve higher voltages. Micro Generator: 1. In strong wind conditions, with no load (such as LED lights), the open-circuit voltage can reach up to approximately 20V. 2. The unit features a built-in USB port and can directly power the included USB light. Other low-power USB devices may operate intermittently but are not guaranteed. Charging smartphones or power banks is not supported due to the absence of a voltage regulation module. 3. When used with an external 5V voltage regulator module, the peak charging current under a household fan's maximum airflow is about 30mA. For example, fully charging a 4000mAh smartphone battery would require approximately 6 days under ideal continuous conditions. (Note: No micro wind generators priced above 100 yuan currently available on the market can reliably charge phones or power banks. Any apparent charging capability without proper regulation is impractical.) Dimensions: Length: 18 cm Inner hole diameter: 2 mm (for shaft mounting) Material: ABS plastic Weight: Approx. 4.8 grams Installation: Equipped with positive and negative paddles. Can be securely mounted on a motor shaft with a 2 mm diameter. Usage: Generates power when exposed to wind flow. Can be installed on bicycles to produce light while riding. Includes a 1-meter USB cable with a 5-watt USB LED bulb for emergency lighting. The bulb can be plugged into a power bank or the generator for immediate use. Package Includes: 1 x Micro Wind Generator 1 x USB Light Bulb