X-Sense Standalone Smoke & CO Alarm w/Voice Alerts
This alarm features a replaceable CR123A lithium battery lasting 5 years. It utilizes photoelectric and electrochemical sensors for smoke and carbon monoxide detection. The alarm emits a sound of ≥ 85 dB at 10 feet with a pulsing frequency of 3.2 ± 0.3 kHz. Price drops from $175.99 to $105.99 with free shipping.