---Welcome to Sound Powered! Choose an option below--- Dynalec Corporation - Sound Powered Communications (SPC) manufactures sound powered telephones for general industry and, under the name VisitPhone, visitation telephones for the corrections market. SPC's sound powered telephones are found in ind...

TO PRINT, CHOOSE "PRINT" FROM THE "FILE" MENU. WHAT THEY ARE & HOW THEY WORK - 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 t...

WHAT THEY ARE & HOW THEY WORK - 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, ...

---Welcome to Sound Powered! Choose an option below--- Dynalec Corporation - Sound Powered Communications (SPC) manufactures sound powered telephones for general industry and, under the name VisitPhone, visitation telephones for the corrections market. SPC's sound powered telephones are found in ind...

Sound Powered Communications Corporation (SPCC) guarantees that its products, as shipped from its factory in Trenton, New Jersey, are free from defects in material and workmanship and undertakes to replace free of charge for a period of one year from the date of manufacture, any part that proves to ...