No plug-in needed, and stronger sunlight means faster fan speed. Four fans deliver 440 CFM airflow for full air circulation. Supports multiple DIY mounting options for greenhouses, chicken coops, and pet houses. Aluminum alloy body with IP65 water rating is designed for hot and humid conditions for steady, long-term use. | Vevor | | Solar Powered Fan, 25W Solar Panel with 4 Fans, Adjustable Solar Panel Angle, 2668 RPM High-Speed, Flexible Installation | Black | Best Buy