WiTbelt is an App for the Bluetooth 4.0 Travel Smart Luggage Belt.User can keep track of luggage conditions Anti-Lost Alert If theWiTbelt is separated from user for a certain distance, the App willsend out an alarm to alert user. Alert distance can be adjusted onthe App. Just one touch from the App, user can call the TravelSmart belt to sound. Features Anti-Lost Alert – Keep your valuableswithin range TSA lock Compatibility Android 4.3 or laterRequirement Android 4.3 or later Bluetooth 4.0 The Smartphoneshould be "Bluetooth Smart Ready" device.