description smoke and carbon monoxide alarm, battery operated the first alert smoke and carbon monoxide alarm has a slim profile, designed to blend more fully into the wall and out of sight. it offers the same functionality you expect from first alert with a new design that takes up less space. the battery-operated smoke and carbon monoxide detector alerts you to possible smoke or carbon monoxide and can be easily installed with no wires required. california proposition 65 warning. features new slim profile blends easily into your home’s decor features a photoelectric smoke sensor and electrochemical carbon monoxide sensor battery-operated unit can be installed easily one button silences the alarm and tests the unit twist-lock mounting system makes installation and battery replacement easy specifications acme tools brand name first alert acme tools part number 1039783 assembled depth (in) 5.67 assembled height (in) 1 assembled weight (lbs) .55 assembled width (in) 5.67 california proposition 65 warning required yes country of origin china globaltradeitemnumber (gtin) 00029054018632 height (in) 1 package contents alarm, hardware, battery and owner's manual package depth 6 package height 2 package weight 2.5 package weight (lbs) 2.5 upc 029054018632