What was the Regency TR-1 transistor radio?

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NMOS transistorNegative-channel metal-oxide semiconductors (NMOS) employ a positive secondary voltage to switch a shallow layer of p-type semiconductor material below the gate into n-type. For positive-channel metal-oxide semiconductors (PMOS), all these polarities are reversed. NMOS transistors are more expensive, but faster, than PMOS transistors. — transistor NMOS transistor
Negative-channel metal-oxide semiconductors (NMOS) employ a positive secondary voltage to switch a shallow layer of p-type semiconductor material below the gate into n-type. For positive-channel metal-oxide semiconductors (PMOS), all these polarities are reversed. NMOS transistors are more expensive, but faster, than PMOS transistors.

The Regency TR-1 was the world's first transistor radio, released in late 1954. It was manufactured through a collaboration between Texas Instruments Inc. and the Regency Division of Industrial Development Engineering Associates.1

Priced at $49.95, the device utilized four germanium junction transistors to function as a multistage amplifier for radio signals. Its development marked a significant milestone in the commercialization of transistor technology, which had begun to replace bulkier vacuum tubes in consumer electronics due to the transistor's small size and low power requirements.1