This Mircom SD-2WT-LED smoke detector is a reliable and high-quality safety equipment that can help protect your home or business from fire hazards. It comes with a photoelectric sensor that can detect smoke particles in the air, as well as a heat sensor that can detect sudden temperature changes. This brand new smoke detector is designed to provide long-lasting and effective smoke detection without compromising your safety. With free shipping included, you can have peace of mind knowing that you have a reliable safety equipment installed in your property.