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They are sound powered. Sound powered telephones, handsets or headsets, contain electro-mechanical transducers that convert voice directly into electrical energy. This signal is sent down to a two-wire line and converted back into voice at the other end. The phones require no batteries, amplifiers or power supplies, emit no electro-magnetic or radio-frequency interference, present the user with no shock hazard and yet are capable of transmitting clear voice communications over distances up to five miles.

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