Here's is an idea that would keep you cool during the hot days. ARC EN CIEL smallest USB Powered portable mobile fan which gives you a style as well as comfort from the hot atmosphere. Its designing allows you to carry it with you anywhere. A cool & stylish cell phone fan which works on USB & Micro USB power. Key Features: Powered by all. Android Smartphone & USB Power whose battery volt is above 5V. Dual Power option makes it completely portable. Energy saving design. Quite, with hurt-less blades. Very light weight makes it very easy to carry. Made of a good quality Silicon. Made of special TPU material, doesn't hurt even if you insert your finger in the moving fan. Can plug it with a power bank and use it as a portable fan as well. Compatible with smartphones launched after 2015.