Ilove and hate smart locks. On one hand, it’s an undeniable treat to be able to get into my house even when I’ve forgotten my keys or make sure things are locked up when I’m away. But on the other, dead batteries, buggy software, and finicky wireless connections can evaporate that convenience, leaving me stuck on my porch, impotently stabbing my finger at a dead fingerprint sensor or waving my phone over a smart lock whose NFC reader just won’t respond. The palm-scanning, Wi-Fi-connected TCL D2 Pro , a new smart lock from a company better known for its cheap TVs than anything else, almost totally eliminates that irritating experience.

The D2 Pro is one of a few recent smart locks, and the second from TCL itself, that work by blasting your hand with near-infrared light, reading the uni

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