Notice: This product is incompatible with smart home systems or the Meross app. Full Home Safety Coverage: The Meross Interconnected Detector uses RF technology to connect up to 12 smoke alarms, ensuring complete coverage without blind spots even through walls. Perfect for full-home protection.  Newest UL217 8th Standard: Certified to the latest UL217 8th Standard, this smoke and CO alarm uses advanced photoelectric sensors for more accurate detection and fewer false alarms from cooking or steam.  Reliable & Long-lasting Protection: Powered by 3 replaceable AA batteries, the detector provides uninterrupted protection for 10 years, even during power outages, offering both safety and value.  Easy-to-Read LCD Screen: Get real-time CO levels (30-999 PPM), battery status, and operational updates. A low battery alert ensures you're always prepared.  Multiple Alert Modes: The 85 dB buzzer, LED indicators, and LCD screen provide clear audio and visual alerts for maximum safety.