Surprise! Facial recognition smart locks are actually good

惊喜！人脸识别智能门锁其实表现不错

I tested four locks that unlock with a look, and while hands-free with UWB is better, if you want a sci-fi experience for your front door, facial recognition is worth considering. 我测试了四款可以通过“刷脸”解锁的门锁。虽然基于超宽带（UWB）技术的免提解锁体验更好，但如果你想为自家大门增添一份科幻感，人脸识别门锁确实值得考虑。

Hands-free unlocking is the future of smart locks. The best smart home tech removes friction, and having your door unlock for you as you walk up is as frictionless as it gets — no passcodes to remember, no need to have a free hand to wave, press, or poke at the lock. One way to achieve this nirvana is through facial recognition. You already unlock your phone with your face; why not your home? 免提解锁是智能门锁的未来。最优秀的智能家居技术旨在消除繁琐，当你走近时门锁自动开启，这便是极致的便捷——无需记忆密码，也不必腾出手来挥动、按压或戳弄锁具。实现这一理想体验的途径之一就是人脸识别。既然你已经习惯用面部解锁手机，为什么不能用它来解锁家门呢？

Hands-free unlocking using geofencing has been around for a while, but it can be slow and unreliable, and requires an app running in the background on your phone. Newer innovations — facial recognition and unlocking using an ultrawideband (UWB) radio — are much better. In my testing, UWB is the best experience. All it needs is your phone or watch somewhere on you to identify you as you approach, and it’s fast and reliable. But today, locks with UWB antennas are expensive, and very few are available. 基于地理围栏（geofencing）的免提解锁技术已经存在一段时间了，但它往往速度慢且不稳定，还需要手机后台运行应用程序。较新的创新技术——人脸识别和超宽带（UWB）无线电解锁——表现要好得多。在我的测试中，UWB 的体验最佳。它只需要你随身携带手机或手表，就能在你靠近时识别身份，既快速又可靠。但目前，配备 UWB 天线的门锁价格昂贵，且市面上选择很少。

It was while reviewing one of them, the Schlage Sense Pro, that I discovered a genuine use case for facial recognition unlocking, a tech I had largely dismissed as an overengineered solution to a mostly solved problem. My husband often leaves his phone in the house when he’s working outside or in the garage, which means no hands-free unlocking for him. If you’re like him and don’t want an unlocking experience tied to a device, but want the speed and convenience of hands-free unlocking, facial unlocking may be for you. 在评测 Schlage Sense Pro 时，我发现了人脸识别解锁的真正应用场景。此前，我一直认为这是一种“过度设计”，试图解决一个本已解决的问题。我丈夫在户外或车库工作时经常把手机落在屋里，这意味着他无法使用免提解锁。如果你也像他一样，不希望解锁体验绑定在特定设备上，但又想要免提解锁的速度和便利，那么人脸识别或许正适合你。

Facial recognition on smart locks uses infrared sensors to create a three-dimensional map of your face. Different companies use different methods — such as structured light, stereo infrared cameras, or time-of-flight sensing — but they’re all designed to do the same thing. The 3D part is key as it captures depth, so holding up a photo generally won’t fool them. 智能门锁的人脸识别功能利用红外传感器构建你面部的三维地图。不同公司采用的方法各异——例如结构光、立体红外摄像头或飞行时间（ToF）传感——但它们的设计目的都是一样的。3D 建模是关键，因为它能捕捉深度信息，所以仅凭一张照片通常无法骗过这些系统。

I tested the four locks you can buy today with facial recognition unlocking — the $300 Eufy FamiLock E40, the $350 Lockly Visage Zeno, Lockin’s $199 Veno Solar Face, and Switchbot’s $230 Lock Vision Pro. 我测试了目前市面上可以买到的四款具备人脸识别解锁功能的门锁：售价 300 美元的 Eufy FamiLock E40、350 美元的 Lockly Visage Zeno、199 美元的 Lockin Veno Solar Face，以及 230 美元的 Switchbot Lock Vision Pro。

The best of the bunch is the Eufy FamiLock E40 from Anker. If I’m going this high tech on my door, I’m going all the way, and the FamiLock E40 is a complete package. Along with excellent facial unlocking features, it also has a fingerprint reader, keypad, and a physical key, plus it doubles as a video doorbell. Stick this on your front door, and you are good to go. 其中表现最好的是 Anker 旗下的 Eufy FamiLock E40。如果我要给大门装上如此高科技的设备，我倾向于选择功能最全的，而 FamiLock E40 正是这样一款全能产品。除了出色的人脸识别解锁功能外，它还配备了指纹识别器、密码键盘和物理钥匙，甚至还能兼作视频门铃。把它装在门上，你就万事无忧了。

Of all four locks, the E40 was the fastest at unlocking using my face – it did it in under a second; I barely had to hesitate before opening. It is also the only one that worked consistently when I was wearing sunglasses. The rest did fine with hats, but struggled with sunglasses. The E40 also includes a backup battery that keeps the keypad active even if the main battery dies and biometrics don’t work — a nice touch. 在四款门锁中，E40 的人脸识别解锁速度最快——不到一秒即可完成；我几乎不需要停顿就能开门。它也是唯一一款在我佩戴太阳镜时仍能稳定识别的门锁。其他几款在戴帽子时表现尚可，但在戴太阳镜时则显得吃力。E40 还包含一个备用电池，即使主电池耗尽且生物识别失效，也能保持键盘正常工作——这是一个非常贴心的设计。

The lock portion supports the smart home standard Matter, so it can work in your ecosystem of choice, and viewing recorded footage from the built-in 2K video doorbell is subscription-free. I also appreciate that Eufy has added a touch of style to this lock; it looks more like a traditional lock than any of its competitors do. 该锁具支持 Matter 智能家居标准，因此可以接入你选择的生态系统，且查看内置 2K 视频门铃的录制画面无需订阅费用。我还很欣赏 Eufy 为这款锁增添的时尚感；相比竞争对手，它看起来更像一把传统的锁。

The downsides are that the Eufy is huge and expensive, and its lithium-ion battery takes nine hours to fully charge, though you can still use the lock while it’s charging. The main battery drains quickly; it dropped 40 percent in a week of testing. Overall, while expensive, the Eufy E40 offers a lot of value, looks good, and works well — as long as you’re willing to charge it regularly. 缺点在于 Eufy 体积庞大且价格昂贵，其锂电池充满电需要九个小时，不过充电时仍可使用门锁。主电池电量消耗较快；在为期一周的测试中，电量下降了 40%。总的来说，尽管价格不菲，但只要你愿意定期充电，Eufy E40 提供了极高的价值，外观精美且性能可靠。