Apple’s AirTag has become the de facto “Bluetooth tracker” since its 2021 debut, upending established players like Tile. The second-generation AirTag still costs $29 for one and $99 for a four-pack, and it's available today. It's powered by the second-generation Ultra Wideband chip (U2), which Apple has employed in recent iPhone and Apple Watch models. For the first time, Apple says Precision Finding is now available on the Apple Watch Series 9 or later and the Apple Watch Ultra 2 or newer. The second-gen AirTag is 50 percent louder than its predecessor, and Apple says it can be heard from twice as far away as before; there's a new chime, too.