From the FAQ: Does Tracking Card Air support Precision Finding?
You can track your items from anywhere in the world using the Apple Find My app, but sound alerts only work when you’re within about 150 feet. Since Apple doesn’t yet support Ultra Wideband (UWB) technology for third-party trackers, Tracking Card Air doesn’t include Precision Finding at this time.
Do these have the ultra wide band chip? you lose a lot of utility without it.
From the FAQ: Does Tracking Card Air support Precision Finding? You can track your items from anywhere in the world using the Apple Find My app, but sound alerts only work when you’re within about 150 feet. Since Apple doesn’t yet support Ultra Wideband (UWB) technology for third-party trackers, Tracking Card Air doesn’t include Precision Finding at this time.