A bendy audio speaker literally made from liquid heavy metal could prove useful for the next generation of wearable technology.

Flexible speakers may be the key to better, wearable music listening devices, says Jeong Sook Ha of Korea University, but that will require alternatives to the rigid loudspeakers and microphones we use today.

Ha and her colleagues have developed a loudspeaker that plays a range of sounds, from piano notes to human voices, even when bent (watch the video below).

The device is …