Quiet operation on low speedThe noise produced by the fan can be termed negligible. The fan runs on extremely low sound and can be used even in a quiet environment.It can be used when you are studying, sleeping and doing other such activities that require silence.10000mAh battery operated clip on fanThe fan comes with multiple power supply options.You can either power it via a USB cable, USB-C or batteries. Even a cell phone adapter can be used for charging the battery present in the fan.The multiple power supply options make it extremely convenient for a treadmill, study room, quiet office, library, outdoor travel, home, bedroom, kitchen, games room, rv, camper, van, traveling, fishing, camping, hiking, backpacking, BBQ, picnic, biking, boating, and so on.Specifications:Battery type: polymer lithium batteryBattery capacity: 10000 mAhUse time: 6-24 hoursCharging method: USBProduct weight: 0.61kgProduct packing list: fan * 1, USB charging cable*1Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.