Aico Ei603RF Radiolink Heat Detector Alarm 10Yr Lithium. Aico Are The Leading Manufacturer Of Residential Fire And Gas Detection Devices In Europe. This Means You Know You Are Getting A Quality And Reliable Product When You Choose Aico. The Aico Ei603Rf Is A Round, Battery Powered Heat Alarm. It Has A Twist On Base Making It Easy To Fit Is Interconnectable To Up To 12 Other Radiolink Alarms. It Has A Memory Feature Which Indicates Whether Or Not The Alarm Has Been Previously Activated. The Alarm Uses A Fixed Temperature Fast Response Thermistor Sensor, Which Triggers The Alarm If Temperatures Go Above 58°C. This Makes It Ideal For Use In Kitchens Or Other Areas Where Smoke Alarms May Be Subjected To False Alarms. There Is Also A Built In Test Button. The Test Is Activated If The Button Is Pressed, Which Checks The Sensor, The Electronics And Causes The Horn To Sound. It Has A Tamper-Proof Lithium Battery Which Has A Life Of Up To 10 Years.