The P4010LDCS-WCA is a 10-year, sealed battery, single-station smoke alarm that features wireless interconnect capability, enhanced intelligibility for users and an LED safety light that illuminates when the alarm sounds to help guide your way to safety. 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 3-colour LED ring helps users quickly determine standby, alarm, or error mode of the alarm. Wireless or hardwire interconnect triggers each connected alarm in the network to sound once smoke or CO is detected, which can provide more time to react to a hazard. Existing networks of interconnected alarms can be expanded with use of a single Kidde AC Wireless Alarm and additional compatible Kidde DC Wireless alarms. Model P4010LDCS-WCA Power Source Sealed 3 V Lithium Battery Sensor Photoelectric Audio Alarm 85dB at 10ft Temperature Range 4.4˚C (40˚F) to 37.8˚C (100˚F) Humidity Range 5%-85% relative humidity (RH) Size 14.2 cm in diameter x 4.9 cm depth Weight 0.27 kg Interconnects Up to 24 Kidde devices Warranty 10 year limited