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" AppDoes not work with Android devices.Battery: Built-in Lithium Battery, 100mAhWhether the battery can be replaced: NoCharging method: Wireless chargingVolume:70-90dBStandby time:3-4 monthsSupport system:iOS(iOS 14.5 and above)APP:for Apple Find MyColour:BlackMaterial:plasticPackage Contents:1 x Smart Track Card(Due to different product batches, the appearance may vary, which does not affect the use)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.