This is an original Texas Instruments TI-5033 OEM power supply with a voltage of 5.4VDC and a current of 500mA. It is compatible with Texas Instruments and is a unit type power supply. The unit quantity is one and it is a vintage product. The California Prop 65 warning is unknown and the country/region of manufacture is also unknown. This power supply is perfect for vintage computing enthusiasts and collectors.
It's old it buzzes. Its exactly what I would expect a 35 year old computer transformer to do.
It's heavy duty plastic and American built by Texas Instruments.