Experience unparalleled protection with the 2-Pack USI Combo Smoke, Fire, and Carbon Monoxide 10-Year Battery Alarm. Equipped with Sensing Plus Multi-Criteria Detection, this advanced photoelectric alarm accurately identifies both slow-burning and fast-flaming fires, ensuring early detection and rapid response. An included electrochemical sensor detects carbon monoxide, for a single compact home safety solution. The 10-Year sealed battery ensures continuous protection, even during power failures. It replaces annoying low-battery chirps with a single end-of-life alert after 10-years to remind you it's time to replace your smoke alarm. The voice alarm feature offers clear guidance differentiating between fire and CO alerts and replacement reminders. Advanced technology reduces nuisance alarms, minimizing disruptions from activities like cooking. Should you experience a false alarm, easily silence it with the test/silence button. With UL certification, you can trust in the reliability and performance of USI Combo Alarms. Invest in peace of mind and protect your loved 1 s with this advanced home safety solution. With over 50-years of experience as a leader in home safety, USI provides reliable, long-lasting protection for your home.. 2-pack smoke, fire, and carbon monoxide alarms. Voice alert for real-time information on the home safety system. UL certified to ensure reliability. Alarm Sensor Type: Photoelectric. Alarm/Detector Features: 10-Year Battery,Hush Button,Light Indicator,Tamper Resistant. Alert Type: Siren,Voice. Battery Type Required: Built-In. Commercial/Residential: Home. Included: Batteries,Installation Kit,Mounting Hardware,Owner's Manual. Pack Size: 2. Power Source: Battery. Voltage (V): 0 V. Certifications and Listings: ETL Listed. Product Depth (in.): 1.7 in. Product Width (in.): 6.1 in