An individual signal unit; each said individual signal unit including;



(a) a transceiver module,
(b) a power supply,
(c) a logic circuit,
(d) at least one of a number of external event sensors,

and wherein a signal from a said individual signal unit to a central control facility causes said central control facility to execute one or more predefined steps; at least some of said predefined steps configured or reconfigurable by an owner of said individual signal unit; at least some of the predefined steps provided by one or more independent parties; at least some predetermined steps configured or reconfigurable by said independent parties.