First Alert 10-Year Battery Combination Smoke & Carbon Monoxide Alarm | SMCO210 Slim Profile Design, Sealed Battery

Manufacturer statement checked 23 Oct 2026 · source

“VARIANT NOTE (2026-10-26, availability repair): Same model (SMCO210) as B0CRRRLRFL, listed under a different Amazon parent. The manufacturer's page above is for the SMCO210; the two Amazon titles name the same model, sealed 10-year battery and slim profile design. The original reading follows, unchanged. First Alert's page for the SMCO210 10-Year Battery 2-in-1 Smoke and CO Alarm with Slim Profile Design, read 2026-10-23: electrochemical CO sensor plus photoelectric smoke sensor, 10-year sealed lithium battery that is not replaceable, end-of-life warning, 85 dB, warranty 10 years limited. The page's "Approvals and Standards" line reads "Conforms to UL 217 10th Edition Standard; Conforms to STD UL2034". The user manual (M08-0600-000) says First Alert smoke alarms conform to UL 217 and cites UL 2034 for the CO side. The page lists the sensor type as "Electrochemical; Photoelectric". UL's own listing directory was not checked, so both standards are manufacturer-stated here.”