Universal Security Instruments Hardwired 10 Year Tamper Proof Permanent Power Sealed Battery 2-in-1 Universal Smoke Sensing Smoke and Fire Smart Alarm, Model MI106S 2-in-1 Universal Smoke Sensing Technology (USST) responds quickly to both fast-flaming and slow-smoldering fires Fully interconnectable with up to twenty-four USI-compatible devices Brackets mount to any standard wiring junction box Suitable for houses, apartments, and mobile homes Comes with a ten-year limited warranty