Aico 150 Mains Alarms with Lithium Batteries
The Aico Ei150 Series mains voltage alarms are largely used in retrofit for existing social and rented properties. If you are not replacing one, them it may be worth considering the Aico Ei160 series.
The 150 Series alarms come with a 10 year rechargeable lithium backup battery, a test/hush button and a five year guarantee.