1. Easy Installation: This is a ready-to-use solar fan. Upgraded solar dual fan comes with a pre-installed solar cable and quick connector, which allows you to easily install it with a quick-connect cable. 2. Widely Used: This Solar Powered Dual Fan is a great solution for small chicken coops, greenhouses, dog houses, sheds, pet houses, window exhaust in hot summer. 10W solar panel with 2 fans kit can push out the hot air and push in the cold air more effectively, thus lowering the rooms temperature and keeping the air fresh. 3. Cost Saving and Economical: Solar exhaust fan runs at a maximum speed of 3000r/min, with a large airflow of 200CFM. it can cool your roof and reduce the load of your air conditioning system at the same time, green energy saving and good for the environment. It will lower your cooling cost with lower electricity expenses. 4. Perfect Cooling Solution: The speed of the fan is greatly influenced by the sunlight. When the sunlight is directly on the solar panel, the fan can reach 3000 rpm. When the sunlight is weak, the fan will work slowly or even stop working. Solar fans without built-in batteries only work during the day. 5. Easy to Carry: The portable Exhaust Fan is small in size and easy to carry. You can hang it on your bag or put it in your bag to carry around when you are camping. The perfect solution to your mobile power and fan two major needs.