Google Glass 2

Google is to sell a revamped version of its smart glasses to businesses, more than two years after the original version of the product was cancelled.

The company said Glass Enterprise Edition had improved battery life and felt more comfortable during long-term wear than before.

However, it still resembles the original model, with a small see-through display and built-in camera.

It will face competition from Microsoft's HoloLens among others.

Many had assumed the project had been cancelled after the executive in charge, Tony Fadell, resigned last year.

However, parent company Alphabet's X division continued to develop the technology and has now revealed its efforts in a post on the news site Medium.

"Workers in many fields, like manufacturing, logistics, field services, and healthcare find it useful to consult a wearable device for information and other resources while their hands are busy," wrote project lead Jay Kothari.

"That's why we've spent the last two years working closely with a network of more than 30 expert partners to build customised software and business solutions for Glass for people in these fields."