The Sony MDR-NC11A noise cancelling headphones reduce noise by a whopping 70% (10dB) when the noise cancelling circuit on the headphones is switched on.

The noise cancelling circuit senses outside noise with built-in microphones and then sends an equal-but-opposite cancelling signal - so all you hear is sweet, sweet music.

But it must be added that with or without the noise cancelling circuit on, the headphones produce a powerful sound for your iPod listening enjoyment.

Additional features include the Sony Fontopia in-the-ear design, in-line volume control and a miniature connection box for the AAA battery.