eGeeTouch Smart Lock NFC Fobs for TSA and 2nd Gen Lock (Keychain) LIGHTWEIGHT & WATERPROOF: These NFC Fobs/Tags are the size of a coin so you can carry them easily for swimming, gym, hiking etc USER SELF-PROGRAMMABLE via eGeeTouch App ONE-TAP function to unlock COMPATIBLE w/ eGeeTouch Smart Padlocks, Smart Luggage Locks & Smart Travel Padlocks