These are a must have for every home. Smoke detectors protect you against fires by alerting you via siren in the unfortunate event of a fire. Smart smoke detectors can also alert your smart phone and turn lights on in your home via IFTTT integration. CO2 detectors protect you against gas leaks, carbon monoxide is deadly, but easily detected. Whether you go for a standard smoke detector or a smart smoke detector, make sure you have something installed in your home!