Compare Quick view First Alert First Alert Wireless Interconnect Talking Battery Operated Smoke & Carbon Monoxide Alarm - SCO501CN-3ST MSRP: Now: $40.99 Was: With this unit, you won’t have to worry about hardwiring or any of that complicated stuff. It runs purely on batteries, allowing you to set up multiple units to create the perfect safety network for your home. You can use up to 16 alarms scattered... MSRP: Now: $40.99 Was: Compare Quick view