Instructions listed for each model number:
E7450 - Location: Top right of keyboardOFF: Wireless symbol not lit up.To turn Wireless On: Hold 'Fn' key and press 'PrtScr' key
| ON: Wireless Switch has light on, Wireless is On.To turn Wireless On: Hold 'Fn' key and press 'PrtScr' key |
E6420 - Location: Right side of laptop OFF: Right (toward screen) wireless is Off.You will see red next to the switch.
| ON: Left (toward you) wireless is On. |
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E6400 - Location: Right side of laptop | ON: Left (toward you) wireless is On. |
D620 and D630 - Location: Left side of laptop | ON: Right (toward you, switch is towards antenna) wireless is On. |