The FireAngel WHT-630 is a 10 year sealed battery thermistek heat alarm from the Wi-Safe 2 radio-interconnected device line.
The heat alarm, which detects substantial rate-of-rise in temperature and can be wirelessly associated with up to 50 additional Wi-Safe 2 devices within a single system, is excellent for kitchens and garages where a normal smoke alarm would be inconvenient.
The alarm has a "locate" function that allows you to simply locate the initially activated alarm within an interconnected system.