Replacing Back-up Batteries in Ei Electronics Alarms | An alarm without a battery will not alert you in the event of a fire. Test your alarms weekly & replace batteries when low #
Ei100TYC Ionisation Smoke Alarm | Aico
Ei 208DWRF RadioLINK CO Alarm With Digital Display & Lithium Backup
Ei208DW & Ei208DWRF Carbon Monoxide Alarm • EI Electronics
Smoke & CO Alarms - EI Electronics
E.I SMOKE DETECTOR (BATTERY OPERATED TYPE) – Green Safety Limited