Please note that Wi-Safe2 units are not compatible with the previous generation Wi-Safe units\nA 10 year, battery powered, sealed-for-life, wireless interlink smoke alarm with groundbreaking Thermoptek\u2122 technology inside.\nThe WST-630 smoke alarm has been designed to give the earliest possible warning of fire via a network of wireless interlinked smoke alarms.\nThis smoke alarm can be used in conjunction with heat alarms (eg in the kitchen and garage) to provide complete protection for the home.\nIt incorporates the groundbreaking Thermoptek\u2122 technology, which provides responsiveness to all fire types in one alarm. Thermoptek\u2122 technology combines the very latest in optical sensing with thermal enhancement, providing fast reaction to both slow smouldering and fast flaming fires in a single alarm.\n\nEach smoke alarm communicates with others by continuously sending and receiving wireless signals creating a 'meshed network.' This ensures that all alarms will trigger simul.