Wireless proximity detection and presence-sensing alarm systems that utilize portable radio receiver and transceiver units to monitor the unintended presence, removal or departure of a person at or from a given location; electronic components of wireless proximity detection and presence-sensing alarm systems, namely, electronic, pressure-sensitive mats and pads and portable radio receiver and transceiver units; electronic wireless monitoring systems, namely, proximity sensors that signal the unintended presence, removal or departure of a person at or from a given location
Electrical and Scientific Apparatus