Works with the Apple Find My App: Add your KeySmart Card to the Find My app on your Apple device. Play a sound on your KeySmart Card to find it nearby, or locate it with the Apple Find My Network Get Notified When You Leave It Behind. The Apple Find My app proactively prevents you from losing your wallet or ID card by sending notifications to your devices Lost Mode Helps You Get It Back. If your KeySmart Card goes missing, you’ll see the last known location on a map Ultra-Slim: Less than 2mm thick and the slimmest tracking card on the market. Wireless Charging: Use any qi-enabled wireless charger to charge your KeySmart Card Long Lasting - 5 Months of Battery Waterproof & Ready for Adventure: Don’t worry about accidents, spills, splashes, or dips. With an IPX7 rating, It can survive up to 30 minutes in 3 feet of water. WARNING: Contains Bisphenol A (BPA), known to California to cause cancer, birth defects, or reproductive harm. More info at www.P65Warnings.ca.gov