Your question is very generic, but in situations where this device might be used most (e.g. walking, getting around) I usually use the following:

  * Guide dog (still the non-technical, living and breathing version)
  * iPhone for GPS navigation if I don't know the environment
  * Aftershokz Bluetooth headset with bone conduction to listen to spoken announcements and still hear what's happening around me

In general, the blind use all kinds of standard consumer tech, smartphone, smartwatch, laptop/desktop etc. There are still lots of products out there specifically designed for the blind, but there is more and more a shift to standard devices.