Does it have a rechargeable battery? how do I use it

Dear customer, Thank you for your question. This desk fan is battery-free and cannot be recharged. This usb fan can be plugged into a power bank or laptop. Please check out the small video we took for you. If you need any assist in the future, feel free to contact us~ Best wishes, SmartDevil

How long does it hold a charge?

The fan has 3 speed modes when powered by a USB output capable of at least 1A. If the output cannot quite handle the highest speed it will likely default to only one speed mode. Sometimes maybe even two. Lowest speed draws about 250mA, medium about 500mA, and high about 1A. I bought a 10,000mAh powerbank to go along with this and put magnets on it so I can have some air blowing on me at work when I'm on a scissor lift up in the ceiling or something like that. It lasts all day on the highest speed. A cheaper 5000mAh powerbank or something will probably last all day on the lowest speed.

How quiet is in each different mode?

Even in low mode it can easily be heard from the room next door. It's about as loud as the fans in popular gaming consoles. It emits an audible "whine" that's higher pitched than a "whoosh" you would hear from bigger fans. On medium and high it gets quite loud and in addition to a high pitch whine emits propeller like noise comparable to the propellers on small RC aircraft. If noise is a big factor for you I would recommend you look at alternative products. Most small fans produce more noise because they have to spin at higher RPMs. If you want an ultra quiet small fan I would recommend the PC fans made by Noctua and just run a long cable from your desktop's power.

What about rpm how much it has?

Dear customer, Thank you for your question. The USB-powered fan produces an even and strong wind. The tested data of the produced wind are followings： Lowel Level: 3.9m/s Medium Level: 4.9m/s High Level: 5.9m/s Hope it would help. If you need any assist in the future, feel free to contact us~ Best wishes, SmartDevil

Brand	SMARTDEVIL
Color	Navy Blue
Electric fan design	Table Fan
Power Source	USB
Style	Casual
Product Dimensions	4.72"D x 4.72"W x 1.97"H
Room Type	Bedroom,Offices,Library
Special Feature	Portable,Space-Saving,Cooling Fan,Quiet Operation,Energy Saving
Recommended Uses For Product	Air Circulation, Home, Office, Outdoor, Travel
Noise Level	25 dB
Wattage	5 watts
Finish Type	Painted
Number of Blades	5
Theme	Portable Personal Cooling
Speed	3 RPM
Voltage	5 Volts
Collection Name	Desk,Home,Office
Switch Type	Push Button
Item Weight	6 Ounces
Included Components	Cord
Indoor/Outdoor Usage	Outdoor
Model Name	Small Personal USB Desk Fan
Control Method	Touch
Connector Type	Mini USB
Blade Material	Plastic
Reusability	Rechargeable
Cable Length	3.9 Feet
Is Cordless?	No
Number of Power Levels	3
Main Power Connector Type	USB
Manufacturer	SmartDevil
UPC	824382310560 749390501925 886268645197
Size	CA2175
Item model number	8541623328
Item Weight	6 ounces
Item Dimensions LxWxH	4.72 x 4.72 x 1.97 inches
ASIN	B07PZBVLC7
Date First Available	March 26, 2019

SMARTDEVIL Small Mini USBDeskFian(Navy Blue)

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常见问题