Emerald’s Heat Alarm features a built-in RF module for easy integration with other Emerald RF alarms in the home, enhancing overall safety. With a 48-hour memory function, it simplifies the identification of faulty alarms, increasing protection against hazards. This alarm is not suitable as a fire safety device unless interconnected to one or more smoke alarms. The battery in this unit is intended to last it’s 10 year service life and cannot be replaced. INCREASE YOUR PROTECTION Receive alerts from your Emerald radio frequency (RF) smoke alarm network anytime, anywhere with SafeLink via your phone and the Emerald app.