1. Ultra-Slim - The Most Sleek Tracking Card Anywhere. The Wallet Tracker Card is the size of about two credit cards - less than 2mm thick - and the slimmest tracking card on the market. Place it in your wallet, luggage tags and more to locate your missing items. 2. "Find My" the network location - Work with for Apple Find My APP, when the smart card out of bluetooth range with your iphone, you will get notifacation on iphone ,what's more , it can be tracked without distance limit to anti lose ,as long as there is other ios devices near by. 3. Lost Mode - Enabled - Enter your contact phone number, etc. If the device has been disconnected from your phone for more than a while, and there is another for Apple device near the device,you will receive notifications and the latest location of the smart tag. 4. Wireless Charging with up to 4 months of Battery - No special charging cable required. Reusable and built to last. The Card lasts up to 4 months on a single charge, so you don't have to worry about recharging it every week. Compatibility: For Apple(iPad/iPhone/Mac) works with "Find My" App Does not work with Android devices. Battery: Built-in Lithium Battery, 100mAh Whether the battery can be replaced: No Charging method: Wireless charging Volume:70-90dB Standby time:3-4 months Support system:iOS(iOS 14.5 and above) APP:for Apple Find My Colour:Black Material:plastic Package Contents: 2 x Smart Track Card(Due to different product batches, the appearance may vary, which does not affect the use)