Google has offered a limited number of prototype phones as part of a development kit to software companies
Google has unveiled a prototype smartphone with "customised hardware and software" that enables it to create 3D maps of a user's surroundings.
The device's sensors allow it make over 250,000 3D measurements every second and update its position in real-time.
Google said potential applications may include indoor mapping, helping the visually-impaired navigate unfamiliar indoor places unassisted and gaming.
It has offered 200 prototypes to developers keen to make apps for it.