description hardwired photoelectric smoke and carbon monoxide alarm with battery backup the first alert sc7010b hardwired combination smoke and carbon monoxide alarm with battery backup delivers both smoke and carbon monoxide detection in a single unit. equipped with a photoelectric smoke sensor and an electrochemical co sensor, it accurately detects smoke produced by smoldering fires and carbon monoxide leaks from multiple sources. if a threat is detected, the alarm emits a spread spectrum horn tone that is designed to be heard by people with age-related hearing loss. california proposition 65 warning. features electrochemical carbon monoxide sensor photoelectric smoke sensor optipath 360° technology end of life signal single button test/silence dust cover spread spectrum horn tone perfect mount - allows for easy alignment of alarm easy installation/maintenance specifications acme tools brand name first alert acme tools part number sc7010b assembled depth (in) 5 assembled height (in) 5 assembled weight (lbs) .7 assembled width (in) 2 california proposition 65 warning required yes country of origin china globaltradeitemnumber (gtin) 00029054002280 height (in) 5 package contents alarm, batteries, installation hardware and owner's manual package depth 6 package height 6 package weight 2.25 package weight (lbs) 2.25 upc 029054002280