Support for braille displays is determined by the underlying support found in brltty. Most displays work under brltty, connected via either a serial port, USB or bluetooth. Details on supported braille devices can be found on the brltty website. &debian-gnu; &release; ships with brltty version &brlttyver;. Support for hardware speech synthesis devices is determined by the underlying support found in speakup. speakup only supports integrated boards and external devices connected to a serial port (no USB, serial-to-USB or PCI adapters are supported). Details on supported hardware speech synthesis devices can be found on the speakup website. &debian-gnu; &release; ships with speakup version &speakupver;.