The Kidde KN-COSM-B-RF is a discontinued battery-powered wireless interconnect combination smoke and CO alarm. Voice alerts announce 'Fire', 'Warning, Carbon Monoxide', 'Low Battery', and 'Caution, Carbon Monoxide Previously Detected'. Wireless interconnect allows all connected alarms to sound when one triggers — without wiring. Dual LED indicators show normal operation (flashing green) and alarm condition (flashing red). This model is discontinued; no announced replacement model listed.
Is the KN-COSM-B-RF still available?
This model has been discontinued. For a current wireless interconnect combination alarm, consider the 30CUDR-VRF, Kidde's current battery wire-free RF combo alarm with DETECT technology.
What does 'Caution, Carbon Monoxide Previously Detected' mean?
This voice message indicates that the alarm detected CO at levels above 100 PPM at some point since it was last reset, even if current levels are now acceptable. It is a memory feature alerting you to investigate the CO source even after levels have dropped.
# Kidde Battery Powered Wireless Smoke and Carbon Monoxide Alarm **Model:** `KN-COSM-B-RF` **Brand:** Kidde **Category:** Combo Alarm Wire Free > The Kidde KN-COSM-B-RF is a discontinued battery-powered wireless interconnect combination smoke and CO alarm. Voice alerts announce 'Fire', 'Warning, Carbon Monoxide', 'Low Battery', and 'Caution, Carbon Monoxide Previously Detected'. Wireless interconnect allows all connected alarms to sound when one triggers — without wiring. Dual LED indicators show normal operation (flashing green) and alarm condition (flashing red). This model is discontinued; no announced replacement model listed. ## Specifications | Attribute | Value | |---|---| | Product Type | Combination Smoke + CO Alarm | | Alarm Type | combo | | Sensor Smoke | ionization | | Sensor Co | electrochemical | | Power Source | battery-aa | | Battery Backup | No | | Battery Type | AA | | Battery Replaceable | Yes | | Voice Alerts | Yes | | Voice Messages | Fire, Warning, Carbon Monoxide, Low Battery, Caution, Carbon Monoxide Previously Detected | | Smart Wifi | No | | App Connected | No | | Ring Ecosystem | No | | Interconnect | Yes | | Interconnect Type | wireless-rf | | Wire Free Rf | Yes | | Self Testing | No | | Hush Feature | No | | Smart Hush | No | | Peak Level Memory | No | | Digital Display | No | | Low Level Co Alert | No | | Explosive Gas Detection | No | | Indoor Air Quality | No | | Strobe | No | | Egress Light | No | | Alarm Db | 85 | | Ul Smoke | UL 217 | | Ul Co | UL 2034 | | Warranty Years | 10 | | Discontinued | Yes | ## What's Included - alarm unit - batteries - mounting hardware Source: https://www.jaspecs.com/kidde/combo-alarm-wire-free/kn-cosm-b-rf-kidde-battery-wireless-combo-alarm/