The PF12:F754010ACSCO-CA is an AC/DC powered smoke and carbon monoxide (CO) alarm with 10 year battery backup and interconnect capability. The voice warning feature accompanies the 85dB tone during an alarm event, and helps reduce confusion with verbal announcements such as “Replace Alarm" at end of alarm life, and “Hush mode activated" when a nuisance alarm is silenced. The threecolour LED ring helps users quickly determine standby, alarm, or error mode of the alarm. Kidde P4010 Series Alarms contain 10-year tamper proof batteries that eliminate the need for battery replacement, and ends worry over unauthorized removal. The unit’s Ambient Light Sensing feature establishes a day/night cycle and prevents alarm chirping in dark conditions. Hardwire interconnect triggers each connected alarm to sound once smoke or CO is detected, which can provide more time to react to a hazard.