The material itself is also typically more expensive than alternative technologies.

"We are looking at alternative technologies because the majority of blind people can't afford this."

Other alternative technologies are still more expensive than conventional sources.

Spending money on alternative technologies pays off a decade or two in the future.

Six months ago we had no good data on alternative technologies.

Here is a look at some leading alternative technologies and their prospects.

An alternative but more expensive technology is Hall effect sensor.

They sense the location by several alternative technologies and provide the related content.

We have therefore opened the way for alternative technologies here as well.

As for alternative technologies- it'll be a while before they scale in terms of capacity, cost and mass production.