The Lightpen for the ZX-Spectrum by DKtronics
There was a lot of accessories for the Sinclair ZX-Serie. Some from Sinclair itself, some third-party:
For the ZX-Printer, the 2040 Printer, the
ZX-Microdrive, the ZX Interface 1 and the
ZX Interface 2 are extra pages avaiable.
The Lightpen for the ZX-Spectrum by DKtronics
Memotech Typewriter-Keyboard for the ZX-81
The Multiface 128, a Hack- and Copycartridge for the ZX-Spectrum
16 KB Memory-Upgrade for the ZX-81
ROM-Cartridge for ZX-Spectrum with Interface 2
Joystickinterfaces for the ZX-Spectrum
Plug-Typewriter-Keyboard for the ZX-Spectrum
Sheikosa GP 50 Matrix-Printer
Together with the ZX-Printer the most used Printer for the ZX-Spectrum