Tamper proof design provides a higher level of security to prevent battery removal• Gives a decade of peace of mind• Hardwired Alarm with 10 Year Permanent Power Sealed Battery Back-up• Maintenance Free Battery Back-up Power—No batteries to replace for the life of the alarm• Saves money—Never replace batteries for 10 years, saving up to $38.00 over the life of the alarm• Eliminates annoying low battery chirps• 10 year sealed batteries provide continuous protection—even in the event of a power outage• 3-in-1 alarm protects against 3 deadly household hazards: Smoke + Fire + Carbon Monoxide• Smart Alarm Technology virtually eliminates nuisance alarms. Ideal for installation in EVERY room• Deactivation key switches alarm off and makes alarm safe for disposal• Lock-out feature prevents deactivated alarm from being reinstalled• Choose this alarm if you are looking for an alarm with superior nuisance alarm resistance• 10 year product end-of-service life warning sounds when it is time to replace alarm• This alarm is suitable for installation in houses, apartments, dormitory, hotels, & manufactured housing• For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on everylevel of the dwelling• Meet New Laws & Legislation. This alarm exceeds industry standards, and is ETL listed to UL 217 and UL 2034• ECO Friendly—Reduces environmental waste & eliminates disposal of up to twenty 9 volt batteries• Automatic temperature and humidity compensation continuously adjusts to variations in environmentalconditions , reducing nuisance alarms• For added security, tamper-resistant locking feature prevents unwanted alarm removal• Perfect option for replacement or retrofitting applications involving existing USI or Universal brand alarms• The larger mounting base covers drywall imperfections and old paint marks• 10 year limited warranty on both battery and alarm