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Power Source	Battery Powered
Alarm	Audible, Visual
Sensor Type	Electrochemical, Ionization
Battery	9V

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The Universal Security Instruments MI3050SB 2-in-1 Smoke and Fire Smart Alarm provides 10 years of continuous protection against deadly threats in the home. New patented Universal Smoke Sensing Technology provides the benefits of both photoelectric and ionization alarms in one device to protect against fast flaming and slow smoldering fires. Perfect for new or replacement installations, this maintenance-free alarm is suitable for houses, apartments, and mobile homes in every room.

The sealed battery (included) will never have to be replaced throughout the life of the alarm, giving you a decade of peace of mind even in the event of a power outage. Permanent Power also saves money from battery replacements (up to $38.00 over the 10-year life of the alarm), eliminates annoying low battery chirps, and helps the environment by reducing environmental waste from disposed of batteries.

Features:

Fast & Easy to Install—No Wiring Required
Take the Guesswork Out of Proper Placement—This Alarm is Ideal for Installation in EVERY room.
Replace Alarms Before They Fail—Perfect for New or Replacement Installations
Combines the Benefits of Both—Photoelectric & Ionization Technology in One Alarm
Microprocessor Virtually Eliminates Nuisance Alarms Caused by Everyday Cooking Smoke, Steam, etc.
No Batteries to Change—Ever!
Lithium–Free 10 Year Permanent Power
Alkaline Batteries are Safer and More Eco-Friendly
Maintenance-Free Battery Power Provides 10 Years of Safety Protection & ZERO low battery chirps!
Tamper-Proof Design Prevents Battery Removal
Single Silence/Test Button—In the unlikely event of a nuisance alarm, the silence feature quiets a non-hazardous alarm

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Manuals:

USI Electric - MI3050SB - Universal Smoke Sensing Technology 2-in-1