Checking, life-saving and teaching apparatus and instruments, namely, apparatus for checking and monitoring alarms and alarm systems, namely, alarm monitoring systems, alarm sensors, radiant heat dishes in the nature of heat sensors, computer hardware and data transceivers; apparatus and instruments for regulating or controlling alarms and alarm systems, namely, electric control devices for alarm systems in the nature of fire, smoke, gas and heat alarm controllers, microchips, remote electrical controllers, thermistors and alarm control panels for fire, smoke, gas and heat alarms; fire-extinguishing apparatus, namely, fire-extinguishers, fire sprinklers and fire blankets; alarm sensors and alarm monitoring systems including security, flood, smoke, fire, carbon monoxide, gas and heat alarms and alarm systems; alarm sensors and alarm monitoring systems which are capable of communicating with other alarms and devices; wireless controllers for remote monitoring and control of the function and status of other electrical, electronic and mechanical devices or systems, namely, alarms and alarm systems; electronic data communication apparatus, namely, electronic communications systems comprised of computer hardware and software for the transmission of data between two points; apparatus for sending messages, namely, portable telecommunication instant messaging devices, switches, cables, exchangers, transmitters, computer hardware, devices for transporting and aggregating sound, data and video communication across multiple network infrastructures and communication protocols; software for managing, controlling and monitoring alarms and alarm systems; software which determines the location of a non-functioning alarm unit; computer software for determining the location of heat, smoke, gas, fire alarm units which are activated by changes in environmental conditions; diagnostic software for heat, smoke, fire and gas alarms; alarm sensors; temperature sensors; electrical and electronic apparatus and instruments for detecting fire, heat or smoke or toxic or noxious substances, namely, carbon monoxide detectors, fire and smoke detectors, particle detectors, radiant heat dishes, humidity detectors, pressure detectors, flame detectors, gas detectors, movement detectors and thermistors; wireless communication installations, apparatus and devices, namely, computer hardware and communication software for transmission of data between two points, wireless transmitters and receivers, and communication antennas, hubs, routers and amplifiers; parts and fittings for the aforesaid goods