And the books cannot be placed on more than one device, so they are not easy to share.

VOA: special.2009.09.03

But at the end of the day, and here's why we just went with binary and not decimal years ago, when you have one implement a computer with a physical device, it's actually really easy to represent the notion of on or off.

但是最终，之前我们采用二进制,而不是十进制，主要是因为当我们用一台实体机器运行计算机时，这实际上很容易用开或者关的概念来表示。

哈佛公开课 - 计算机科学课程节选

He says it was not easy moving with this device.

VOA: special.2010.06.11

Connecting to any audio device is easy using the 3.5mm auxiliary cable (included).

ENGADGET: Edifier e10 Exclaim PC speakers punctuate the air with 36W of sound

The idea of using silicon fabrication technology for an implanted device was easy to come by, but the design of the release mechanism was hard.

FORBES: Magazine Article

Speaking to the BBC in 2003 Dr Jones said: "I found inventing the device the easy part but producing it, developing it, and selling it was the challenge".

BBC: Dr Tom Parry Jones: Breathalyser inventor dies, aged 77