Contains both an optical and heat sensor for a total fire response. Mains powered with a 10-year rechargeable lithium cell back-up. Add an Ei3000MRF module (89945) for wireless interconnection and data extraction. Compatible with other Aico mains powered units. Features AudioLINK+ data extraction technology and dust compensation. Includes an easy-fit base and has a 10-year life. Produces an 85dBA alarm at 3m and has a Test/Hush Button. Compliant with BS EN 14604: 2005 and BS 5446-2: 2003. The Ei3024 Multi Sensor Fire Alarm is built on high quality, reliable technology with the latest enhancements, making it an effective domestic fire alarm. It can detect all fire types with its combination of Heat and Optical sensors, simplifying alarm choice. The alarm contains Audio LINK technology, allowing data extraction to a smartphone or tablet via an App, generating reports on activation dates, sensor status, and alarm life.