[Ultra-Quiet Working] Mosquito Repellent Makes Almost No Noise. The Working Noise Is Less Than 30 Db. The Silent Fan Can Provide A Nearly Silent Sleeping Environment And Will Not Affect Your Night Sleep. Let You And Your Family Have Sweet Dreams. [Working Principle] This Product Is The Light Generated By The Photocatalytic Inhalation Mosquito Killer, So That Bring The Mosquitoes Close To The Light Source , The Fan Generates Airflow And Quickly Sucks Them Into The Mosquito Killer Mosquito Storage Box, Then Dries The Air And Died Of Dehydration, Physically Kills Mosquitoes, Non-Toxic, Smokeless And Tasteless T [Usb Connection] It Is Powered By The Usb Port, Which Is Very Convenient. You Can Use Power Banks, Laptops And Other Usb Devices To Charge It. Whether It Is A Closed Dark Environment At Home, In The Office, In A Workshop, Store, Restaurant, Hotel, Etc., You Just Need To Connect The Usb To Work. [Easy To Clean]The Mosquito Killer Is Very Easy To Clean And Wash. Rotate To Take Out The Mosquito Box, Clean It With Water, Wipe It With A Cloth And Reuse It. [Please Note]Please Turn On The Mosquito Repellent In The Room In Advance (3 Hours) In Advance, And Keep The Environment Closed And Dark. Do Not Activate The Mosquito Repellent Before Sleeping. Try Not To Turn On Lights, Open Doors And Windows And Do Not Place It At The Outlet Of Air Conditioners Or Fans. Turn Off Other Lights When Killing Mosquitoes To Ensure That The Mosquito Killer Light Source Is The Only Light Source. ,