OPOLAR Rechargeable Battery Operated Clip on Fan

【Stronger Wind and More Speed】-Thanks to OPOLAR's latest dynamic technology, the maximal fan rotating speed arrives to 4000rpm. 4 speed, but less noise. Plus it provides four gears to adjust the speeds to satisfy all your needs 【Enhanced Clamp】-To offer the best clip fan, we have made many tests to ensure the clamp was strong enough to clip and stay put, even on a moving baby stroller. 【Rechargeable Battery or USB Interface as Power Supply】- the mini USB clip fan comes with a 2200mAh lithium battery; which lasts from 2 to 8 hours depending on the wind speed. Each battery has been detected THREE TIMES to ensure the best quality before leaving factory; you can also power or charge via USB interface of computers, power banks, or USB chargers. 【Compact Size & Multi-usage Scenario】-(5.5*3.9*7 inch), (9.58ounce), lightweight, handy, clip fan and desk fan in one, easy to carry and store, can be placed or clipped anywhere you want, great for baby stroller, home and office, laptop, gym wor