Not much bigger than a die, this tiny speaker defines the word portable.

Simply attach the Micro Speaker to your keyring, and with the included auxiliary cable, you'll be ready to connect up to just about any portable music player via a 3.5mm headphone jack.

With a built in amplifier, the speaker claims to pack a fair punch for its size, and requires no batteries - simply charge it through the USB port on your computer.

The Micro Speaker is available now for £9.95.