Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
# Compatible with smartphone NFC. # Compatible with NFC modules like this one for Arduino: SKU.233152. # Really waterproof. # Can be added to a keychain. # Cheap, cheap and cheap, I bought that one to test and I already bought some more with other shapes. #
# There is no cons for this product. #
# There is some apps that recognize those NFC tags and trigger actions like turn on/off wifi, mobile data, GPS, call someone etc. # I use an app called Trigger on my android device that has NFC support. #
# When my tag is close to my device, it calls my girlfriend. #
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