The Meross MA151-EU (intelligent smoke detector) is a reliable and innovative all-in-one home security system. It works exclusively via a compatible Matter hub (not included) and combines smoke detection, intrusion and tampering attempt. It communicates instantly via the Meross app to alert you in real time. Reliable for long-lasting protection, it is designed to operate wirelessly at 433 MHz with a discrete and secure range. Main functions. 3-in-1 detector: smoke, intrusion and tampering attempt combined in one device. 85 dB audible alarm on detection, supported by a 110 dB stroke siren for an audible signal on multiple devices. Double optical sensors to reduce false alarms (smoke vs. vapour). Very low false alarm rate, compliant with EU standards, with triggering in just 0.02 seconds after repeated detection. Service life of 10 years.