Using the Wireless Key
To turn on wireless, with the computer turned on, press the wireless key combination
(<Fn><2>) 
on the keyboard. A confirmation of your selection appears on the screen.
Setting Up Your Inspiron Ultra Mobile Device
This key combination allows you to quickly turn all of your wireless radios (Bluetooth® and WiFi) off, such as when you are asked to disable all wireless radios on an airplane flight. Pressing <Fn><2> one time turns all of your radios off. Pressing the key combination again returns your wireless radios to their respective states they were in before you pressed the key combination the first time.
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