ACTIVE NOISE CANCELLING (ANC) - The Clam is provided with Active Noise Cancelling technology. This feature detects the noise around you and creates a counter noise to create silence OVER-EAR HEADPHONES - The Clam are over-ear headphones that closes off your whole ear. This way the ambient noise is reduced naturally. To create complete silence, just switch on the ANC WIRELESS PLAYTIME: 35 HOURS - Enjoy over 35 hours of wireless playtime with ANC off and 30 hours with ANC on FOLDABLE & ROTATABLE - The headphones are foldable and rotatable for maximal comfort. The flexibility of the Clam makes it the ideal travel buddy for long and short trips