Smart Key app gives Android users added functionality direct from smartphones Integrated microphone and multi-function control button 30mm driver units with ferrite magnets accurately reproduce a broad and dynamic frequency range and a powerful bass response Swivel-fold ear pads enable easy stowaway in backpacks, book bags or purses Soft, pressure-relieving ear cups and padded headband keep you comfortable during wear Four conductor gold-plated, L-shaped plug ensures a good connection Durable 1.2m flat Y-type tangle-free cord