Electric, electronic, or electrochemical oxygen monitors and sensors for environmental use; Electrical sensor apparatus for sensing the presence or absence of individuals or objects by contact or pressure; Electronic data relays for sensors; Electronic motor vehicle ignition tuning kits comprised of an electronic control unit that monitors engine performances and delivers re-calculated sensor values to the original engine control unit to increase engine performance; Optical sensors; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carbon monoxide and smoke detectors; Sensors and detector units for use in controlling the actuation and operation of automotive safety apparatus and equipment; Telecommunications equipment, namely, fiber-optic transceivers, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including Ethernet switches and routers, fiber-to-the-home and ethernet-over-VDSL access aggregators, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices