The ‘Interface 1bis’ is the only ZX Spectrum (48,128,+2,+3) expansion device that features the combined functionality of
- Local storage, of up to 8 GB, subdivided in logical drives of 32 MB, on one micro SD card.
- Remote storage, of unlimited size, with long filename support, on a server machine, connected via a full-speed USB port.
- Non-volatile 128 KB RAM drive, for application that need to store data frequently and fast.
- Kempston joystick port.
- PS/2 mouse port, producing Kempston mouse or Kempston joystick output. 
  Following devices are also supported by the operating system and are automatically identified, when attached to the mouse connector:
    PS/2 keyboard
    Asynchronous serial communication cable, with or without a RS232 trans-receiver
    Serial printer, through a RS232 trans-receiver
    Parallel printer, through a serial to parallel adaptor 
    'EAR' cable for rendering tape files as audio signal
- Ethernet connectivity, by means of an optional, third party, add-on module.
- Wi-Fi connectivity, by means of an optional plug-in daughter board.
- Maximum software compatibility to the original 'ZX Interface 1' of Sinclair Research Ltd.
- Enhanced 'Extended BASIC' with comprehensive random-access file handling capabilities and full emulator (.SCR, .TAP and .Z80) files support. Files in .TZX format can be loaded either directly, if they contain only standard speed blocks, or otherwise, using the built-in 'tape player' and the 'EAR' cable.
- Integrated Game Browser and File Manager, with mouse and joystick control, being able to access besides the on-board SD card and a server PC, connected to the USB port, up to seven networked 'stations', which can be PCs or 'Interface 1bis' units, over the Internet, as well as the games und utilities archive of the 'Word of Spectrum' and archive.org sites.