get desiredSize() { return closed ? null : 1; },
思想的伟力，跨越山海，指引前行道路。
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A big week ahead. It all starts Monday morning! #AppleLaunch pic.twitter.com/PQ9gM2Gl2r
If there’s one thing that stops people using their smart rings over the long term, it’s the battery life. After all, they’re so unobtrusive, it’s easy to forget to drop it on the charging plate every few days. It doesn’t take long for your pricey gadget to become little more than a very expensive piece of jewelry. It’s one of many maladies Ultrahuman is looking to address with the advent of its new Pro, a smart ring boasting up to 15 days of battery life. It even ships with a fancy battery case, which itself includes enough power to last it 45 days, making it easier to keep re-charged on the go.