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Alarms designed to activate audible (i.e., sound) and/or visual signals when cellular telephones, walkie-talkies, or any other radio-frequency transmitters are operated in the vicinity (e.g., inside the same room) of electrical or magnetic medical devices vulnerable to radio-frequency signals (i.e., electromagnetic interference). These devices include the appropriate sensors to detect the radiated electromagnetic field, typically from 400 to 2,000 MHz), electronic circuitry, and sound and/or light sources as alarms. Cellular-telephone detection alarms are used to alert users and healthcare personnel of the operation of cell telephones inside a healthcare facility near vulnerable or potentially vulnerable medical devices (e.g., defibrillators, ventilators).
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