price: 16.99 GBP platforms: Spectrum
Interface 2 style cartridge slot
Initially there were just 10 cartridges released back in 1983/4 but there have been third party ones since.
Compatible with all models of ZX Spectrum. There's a small switch on the interface to select the type of computer, which can be set as: 16K/48K/128K/+2 or +2A/+2B/+3
Also has a reset button.