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Setup should theoretically be easy—just scan a HomeKit code in the Onelink app—but it took a few tries to get it to work. The Onelink smoke and carbon monoxide alarm is good on its own, but the Nest Protect does more for the same price. What to look for in a smart smoke detectorFire and smoke detection sensors. All smoke detectors use one of two types of sensors to detect fires. Ionization type sensors are best at detecting fast burning fires, while photoelectric sensors are generally better at alerting you about smouldering, or slow burning fires. You should have both types of alarms in your house. Smoke alarms such as the Nest Protect are designed to pick up both types of fires. Carbon monoxide and other gas detection. Even if you don't have a fire in your home, you can be suffocated by carbon monoxide. A good detector should also protect you against this. Hardwired vs.