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Alecto COA1910 - Carbon monoxide alarm with 10 year sensor runtime

Alecto COA2650 - Carbon monoxide alarm with 10 year sensor runtime and display (successor COA-26)

Alecto COA3910 - Carbon monoxide alarm - 10 year sensor - Display

Alecto COA3920 - Carbon monoxide alarm with 10 year sensor runtime and display

Alecto COA4010 - Carbon monoxide alarm with display and 10 year battery and sensor runtime