Brk, 10 year sealed battery ionization smoke alarm, includes an easy twist mount & matching hardware, increasingly loud 85 decibel sound output & a powerful led indicator add tremendous versatility to an already flexible alarm unit, an end of life warning has been included & will actively alert you & your surroundings whenever the alarm is in need of a replacement, swift & near effortless installation process, meeting ul217 standards, 10 year limited warranty, note: please check your local building code requirements before installing this product to determine compliance with applicable standards.