1.[Works with Find My App]Key Tracker Card paired with Find My App, you can set up left-behind alerts and find lost items nearby with a loud alarm. This key finder has a Bluetooth range of up to 328 ft and a beeping sound ring of up to 80dB, enough for you to easily find it indoors or outdoors! 2.[] Wallet Tracker Card supports wireless charging, eliminating the need for battery replacements. With just one charge, you can enjoy a full year of usage, saving you the trouble of weekly charging. Key tags boasts an extraordinary battery life of up to 100 years, ensuring enduring and reliable performance. This is an environmentally friendly locator designed for sustainability. 3.[Privacy and Security]All communications with the 'Find My Network' are anonymous and encrypted. luggage tracker does not store location data or history, prioritizing the protection of your privacy. 4.[Ultra-Slim & ]Weighing only 0.42 oz with dimensions of L 2.12' x W 1.77' x H 0.11'. The thickness of the key tracker is approximately twice that of a credit card. Perfect for the wallet, passport, luggage, etc.