Profile: Sound Powered Communications, Inc. manufactures sound powered telephones for general industry. We provide visitation telephones for the corrections market. Our sound powered telephones are found in industrial plants. Our VisitPhone System 500 consists of two handsets, each connected to a stainless steel two-gang wall plate via stainless steel armored cable. Chrome plated handset hangers are attached to the wall plate. Amplifiers are attached to the back of the wall plate on the public side of the visitation booth.