An Israeli startup has launched a system that aims to make mobile computing easier by letting users type on invisible keys instead of a keyboard that typically takes up much of the screen.

The keyboard has four invisible keys -- two on each side of the device's screen -- each comprising six to seven letters. There are other keys for numbers, punctuation and symbols.

At first, the location of the keys appears on the screen but the company believes users will quickly learn the location of letters and will not need the overlay for long. Users tap the invisible keys with their thumbs and the system predicts the words.