●Can't Find a Quieter Handheld Fan than This (Around 39dB) ---- With a larger twist angle fan blade design, it brings 3800rpm stronger wind. 20% wider cage greatly reduce the noise when airflow becomes bigger. This fan is quieter than any other handheld fans. ●Absolute MUST Have Fan for Outdoor---- When we’re planning a trip, watch tournament or play in the amusement park with kids. A personal climate control fan could become a lifesaver. No more sweat and complaints during your happy time. ●Detachable Battery---- Fan unit can be disconnected from the supplied battery. The fan unit can be plugged directly to a micro USB for times you have a wall plugin. You can run it all night with wall plugin and still have a fresh battery the next day. ●5000mAh Battery Capacity---- Designed mainly for personal use with close accessible features. The maximum run is 18.5 hours on low, 8.5 hours on medium and 4.5 hours on high-speed. With 5000mAh battery this great mini fan is an exclusive product with a long time run. ●Say Bye to Long Time Charge ---- Enabled with 10W quick charge, it only takes 4h to be fully charged with 5V-2A adapter. *For Any Helps, reach out to us by mail with your queries to support@opolar.com