The latest technology based on the electrochemical cell ensures the accuracy and reliability within the six year warranty and the seven-year lifetime under normal operating conditions. This technology is officially approved and meets the strict requirements of the European standard EN50291: 2001 for home alarms detecting carbon monoxide. The alarm H450 is easy to attach using the supplied mounting kit, any wiring is needed. This alarm, battery-powered, has a six-year warranty for maintenance-free operation. The batteries are sealed inside the alarm and are not accessible to users. Throughout the lifetime of the alarm (up to 7 years) it is not necessary to replace them.