This is a brand new, replacement power supply with 3.5mm plug adaptor which is 100% compatible with the ZX80 and ZX81.
A modern, efficient power supply PSU rated at 3A, giving plenty of "head room" for additional peripherals. The original Sinclair ZX80 / ZX81 PSU's were rated at between 0.7A to 1.4A depending on the version.
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