Hardwired alarms are safer than traditional battery only operated alarms as they continuously have power and do not go 'flat'. In addition to this, modern day hardwired alarms cost very little to run, a very small amount of power to maintain itself from existing circuits such as a lighting circuit. Most hardwired alarms also have the added feature of 'linking', so if one alarm activates, each alarm on that connection sounds, minimizing the chance of people in the premises not hearing the alarm. A 'link switch' can also be linked on the circuit so that if a false activation occurs, the alarms can be silenced or reset from a switch conveniently located rather than the traditional methods of having to access the alarm on the roof.