Using NFC Task Launcher, you can program the tag to 'switch,' so that when you exit your house and tap the tag for the second time, it changes those settings (like disabling Wi-Fi.)
Put an NFC tag near your door and set it to do things like: enable Wi-Fi, decrease brightness, disable Bluetooth, and auto-sync. Undoubtedly, the most common way Android owners are using NFC tags is to efficiently adjust a series of system settings based on the arrival or departure of commonly visited locations.
