Premier écouteur à base de graphène

Graphene has extremely low mass density and high mechanical strength, key qualities for efficient wide-frequency-response electrostatic audio speaker design. 

http://www.extremetech.com/electronics/150646-berkeley-creates-the-first-graphene-earphones-and-unsurprisingly-theyre-awesome

http://www.physics.berkeley.edu/research/zettl/projects/graphene_loudspeaker/speaker.html