Description Warm Notes: This solar fan not built inside battery backup, The fan performance be dramatically reduced if the day is cloudy or any shade at the panel, stop working during rainy day or at night. IP67 Waterproof: This solar fan kits with waterproof function, whole waterproof component. Waterproof solar panel, connector, on/off button, and dual IP67 waterproof fans for outside chicken coop, greenhouse, shed, dog house use. 2 Times Air Flow: With 2 high quality separate fans which built in dual ball bearing and DC brushless motor. High velocity up to 3500RPM, compare with other solar fan which only include 2 normal fan or 1 normal fan. 15W Solar Powered: high efficiency monocrystalline solar panel which provide more power The fan can still work even in dusk, dawn, or cloudy day. Color: As Shown Material: plastic Package Contents: 1 set x Solar Powered Fan Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.