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4-Inch Plastic Solar Ventilation Fan 6W Panel 4A Battery. It only needs to be exposed to sunlight to operate; no electricity required, zero electricity bill. High airflow quickly removes stuffy, stale air, eliminating odors and dampness. Quiet operation, suitable for bathrooms, storage rooms, and pet rooms. Super easy installation; no wiring or drilling required, can be installed outdoors. Waterproof and durable, resistant to wind and rain. One-time installation provides free ventilation and cooling all year round.