Radios; Acoustic alarms; Alarm bells, electric; Audio-receivers and video-receivers; Baby monitors; Burglar alarms; Electric door bells; Electrical and electronic burglar alarms; Electronic personal emergency response system consisting of a device worn on the body with a button that users push to notify others in the event of an emergency, and a remote unit that dials out on the telephone for help; Infrared detectors; Radio pagers; Remote control telemetering machines and apparatus; Smoke det...