This is a vintage New Old Stock (NOS) Realistic Telephone Pickup, catalog number 44-533A. It is designed to attach to the ear piece of a telephone handset using a suction cup and plugs into the microphone jack of a tape recorder to record phone conversations. Features: – Brand: Realistic (Radio Shack) – Part Number: 44-533A – Easy installation: suction cup attachment – Compatible with most vintage tape recorders with a standard mini-plug mic input – Custom manufactured in Taiwan for Radio Shack, a Division of Tandy Corporation – Condition: New in original vintage packaging.