Why do you need this Portable Desktop Keyboard Vacuum Sweeper:Simply, to save your time from cleaning annoying crumb dust on your desk/sofa/dinner table/counter etc..Why this one:1.Helpful and convenient:Powerful suction ability can help you save more energy and time after the whole day?s tired working.Low noise mute design will give you a quiet relaxed environment while cleaning. It is a very good housework helper for you.2.Portable & Cordless:Lightweight mini handheld vacuum cleaner, cordless design make it pretty handy,you can use it anytime any where3.Multi-function & Wide application:- Vacuum hidden dust in the gap of keyboard, air conditioner?s air vent; Vacuum the cigarette ash, bread crumbs, paper or pencil scraps on the desk both at home or office- Vacuum pet hair on sofa, food crumbs in pet house- Vacuum dust, cigarette ash in car- Vacuum the particles in makeup bags, other small scraps in handbagInstruction:1.Unscrew the cover in counterclockwise direction and remove it2.Put in 2 AA batteries(Not include) and screw the cover in clockwise direction to close it3.Turn on the switch to start the machine. The brush help to sweep stubborn stains4.Press the ?Push? button and pull out the bottom. Clean the dustbinSpecification:Item description: Mini Table Dust Vacuum CleanerVoltage: 3V (2 AA batteries)Continuous working time: ? 10 minBrush height: 4±0.8 mmAttention:1.Powered by 2 AA batteries2.To avoid damage, the continuous working time should be less than 10 minutes2.Use brush, paper to clear the dust,crumb or debris in the dustbin. Please don?t wash the machine4.Keep fingers away from the hole on the machine bottom while it is working5.Children should use only under adult supervision