Compact, foldable design : Flat and foldable, easily slip them into your bag. Plus, you can take them anywhere, thanks to a compact carrying case , Cable length 1.2 meter Active Noise Cancellation: Whether you’re listening to a book on your commute, catching some sleep on the plane or taking a call in a noisy café, you’ll hear only what you want Long-lasting battery: Get 15 hours of playback with both Bluetooth and Active Noise Cancellation turned on and up to 30 hours of playback with just ANC turned on; Bluetooth transmitter frequency range: 2402 ? 2480MHz AKG signature sound : AKG has devoted decades to delivering a sound experience that ignites creative expression. Balance gives you smooth, multidimensional tones rather than overpowering bass