Good Vibrations (formerly Silent Call and Personal Alert) is a sound monitor system that alerts individuals who are deaf or hard of hearing to audio stimuli in the household. The user wears a small receiver unit that simultaneously vibrates in response to a signal from any of several transmitted signals. Transmitters are available for detecting: sound (such as a baby's cry), smoke in the house, telephone ringing, doorbell ringing, or a pager (each sold separately). The receiver features four lights on the faceplate, indicating which of the four transmitters is the source of the signal. The system can be used with one receiver and with as many transmitters as desired. OPTIONS: Smoke Detector with Transmitter, Door Bell Transmitter, Telephone Transmitter, Rechargeable Sound Monitor, Pager Transmitter, and a Beacon Type Strobe Light. A Sleep Alert/ Charger (see separate entry) for 24 hour operation of the Good Vibrations System is also available. POWER: Uses a rechargeable 9-volt battery (included). WARRANTY: Five years.