You are a trackable, hackable wireless beacon, thanks to the gadgets you carry. Your phone, Bluetooth earbuds, smartwatch, key fobs, and other Bluetooth, NFC, and Wi-Fi devices can all uniquely identify you and potentially be accessed. So, is this a realistic threat, and what can you do about it?
Source : How Can You Protect Your Car, Devices, Keys, and Cards from Wireless Hacks?