"The first thing I love about the SmartCard is its thickness, or more specifically, its thinness! At only 2 mm/0.08 inches, it's the equivalent of two credit cards, so it sits nicely in your purse or wallet with no unsightly and uncomfortable bulges or bumps. KeySmart managed to make this card so thin by eliminating the bulky and replacing it with a rechargeable battery. This battery is recharged using a wireless charger, and requires a charge every five months or so."
"Because there are no battery compartment covers to break off or lose, the tag is super robust. It is built to IPX7 standards for dustproofing and water resistance, meaning it can survive up to 30 minutes of immersion in 3 feet of water. Despite being thin, these tags are tough and take quite a bit of bending and squeezing, so they will survive a life of abuse in wallets and purses."
AirTags use replaceable CR2032 batteries and are relatively thick (8 mm), making them awkward to attach and wasteful due to frequent battery disposal. A thin alternative, the SmartCard, measures 2 mm (0.08 inches) and fits in purses and wallets without bulges. The SmartCard replaces disposable cells with an internal rechargeable battery charged wirelessly, offering roughly five months between charges and compatibility with MagSafe chargers. The device houses finder circuitry, a battery, and a wireless charging coil inside a durable shell. Absence of removable battery covers improves robustness. The SmartCard meets IPX7 standards and resists bending and squeezing.
Read at ZDNET
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