Strong wind series,PCB outside. (1) 48/56inch fan blade ;With speed controller box . (2)Pure copper DC brushless motor. Protection of opposite connection, stable power function. ≥325RPM in high speed in 12V battery,air pressure:≥250CMM Can used from 6V-24V. (3) metal materials; (4) working method: DC 12V power/battery/Solar panel. (5)Power:8W in 1speed, 13W in 2 speed,19.5w in 3 speed,25w in 4 speed, 42W in 5 speed. Q : Are you a factory or trading company? A : We are factory directly, which produce different kinds of the electrical fans and clothes dryer like: Solar AC/DC ceiling fan, Stand fan, wall fan, table fan, exhaustl fan,floor fan and etc. Q: Why should you buy from us not from other suppliers? A:We specialize in electrical fans and clothes dryer in 10 years, our products have passed CE,RoHS,SAA,BIS AND CB certification, also we have good quality control. Q: How can we guarantee quality? A:Always a pre-production sample before bulk production; Also we will testing in the production process. Q. What's the payment terms? A: We can accepted T/T, L/C, Western Union, D/P. Q. What's your lead time of the order? A: Samples within 7 working days, bulk orders within 28 working days after receiving deposit payment and all artwork confirmation. Q. How long is the warranty? How do I install the product? A: We will provide 2 years warranty. If you have any questions,Kindly feel free to contact us.Your inquiries will be paid highly attention.