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wireless microphone system comprising a portable, battery operated FM transmitter and microphone therefor, and FM receiver with audio output; hearing assistance transmitter system comprising a stationary FM radio transmitter, a battery powered portable FM receiver, and an earphone; hearing assistance transmitter system comprising a portable, battery powered FM radio transmitter and microphone therefor, a battery powered portable FM receiver, and an earphone; hearing assistance system comprising a battery powered, portable audio amplifier with microphone and earphone; hearing assistance system comprising a stationary infrared transmitter and portable, battery powered infrared receiver with earphone; amplified telephone with large keys, adjustable volume and enhance, noise reduction, anti-feedback circuit, and automatic shut-off of amplification; amplified telephone ringer with adjustable volume, tone, and warble; closed circuit intercom to overcome oral communication barriers and including interconnected telephone handsets, one of which provides sound amplification; wireless, multi-channel FM radio system for simultaneous language interpretation comprised of a stationary FM transmitter and portable, battery-powered single channel and multi-channel FM receivers and earphones; speech amplifying system comprised of a portable, battery powered amplifier with microphone and loudspeaker