Eufy's latest smart lock is literally a palm reader

We've seen smart locks that you unlock with a keypad, a phone, or even facial recognition, but Eufy's latest model--which is actually a video doorbell and a smart lock--serves up a relatively new way of opening your door by scanning your palm. Available for pre-order next month (existing Eufy users can place a pre-order now), the Eufy FamiLock S3 Max isn't the first smart lock to employ this new biometric authentication method. TP-Link's Tapo brand showed off a palm-recognition model at CES, for example, and we've also tested palm reader-equipped smart locks from Philips and TCL. The technology is pretty cool, with the integrated reader using near-infrared light to scan the "sub veins" of your palm. The lock then compares the scan to those in a database of previously enrolled palm scans and, if there's a match, voilà!