Most card-style trackers claim to be "wallet-friendly" and then don't actually fit in a card slot without adding noticeable bulk. The Rhinokey Smartcard is built at just 1.8mm thick, thin enough to sit in a card slot alongside your actual cards without forcing your wallet to bulge.
It connects to both Apple's Find My network and Google's Find Hub, which matters more than it sounds: it means the tracker works regardless of whether you or the people around you are on iPhone or Android, tapping into whichever network has more devices nearby to help locate it.
Battery life is rated at five months per charge, and rather than replacing a coin cell battery, it charges wirelessly, so there is no battery door or replacement cell to lose track of. It's also waterproof, which matters for something that's going to live in a wallet through rain, spills, and everyday wear.
Who it's for: anyone who's misplaced a wallet before and wants a genuinely slim way to make it findable, without the bulk some card trackers add.
Bottom line: at $39 (down from $49), backed by a company with 150,000+ customers and a portion of proceeds going to rhino conservation, this is a low-cost way to stop worrying about a lost wallet.
