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It could be a RAM pack for this BASIC 2000 / Lambda 8300 computer, which is a ZX81 like computer (not a clone, but similar).
Compare the case with the Sinclair version.
Or the Timex version.
The RAM packs and printers for the ZX81 can be used with it and visa versa. Most prefer the black RAM pack for their ZX81 and the beige RAM pack for their Lambda 8300, but they are interchangeable.
The ULAs in ZX81 and Lambda 8300 are different. Lambda includes beep-speaker and joystick port.
Software is not interchangeable, but if you use plain BASIC with no PEEK/POKE for specific addresses, Lambda 8300 will detect a ZX81 Basic program, load it and convert it to Lambda Basic. The other way around it not possible. Since there is almost no software for the Lambda 8300, and loads of software for ZX81, someone made a special version of the ZX81 ROM, which is compatible with the Lambda 8300, and then lots of ZX81 software works fine.
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube