Top features:- Bluetooth connection to connect to your devices effortlessly- Superb sound thanks to high power drivers- Deep bass and sealed design for less background noise- Functional design for comfort and easeBluetooth connection The Fidelio M2BT Bluetooth Headphones feature advanced Bluetooth 4.0 technology that makes connecting your headphones to your mobile devices a breeze. This technology is compatible with AAC, APT-X and SBC formats, so you can enjoy high quality wireless sound. When you're not using Bluetooth, you can make use of the 1.2 m headset cable to plug directly into your devices. There's also a one metre charging cable, making it easy to keep the batteries full of power. Superb sound Tuned and tested 40 mm drivers deliver balanced and natural sound that adds quality to every song you listen to. The high powered neodymium magnets reproduce fine details across a wide dynamic range. Deep bass and sealed design The Bass Reflex System (BRS) built into the closed back design of the Fidelio M2BTBK/00 means that you can enjoy deeper bass. Strategically-placed vents regulate the air pressure within the earcups, which helps to reproduce stunning sound. You'll be able to enjoy dynamic bass without compromising sound quality. These headphones feature an acoustic seal that helps to prevent sound from leaking and keeping sound details pure. This not only helps to improve the bass but can also help to reduce background noise that can ruin your entertainment.Functional design Perfect for taking phone calls on the go, the Fidelio M 2BT Headphones feature dual microphones. Whilst one microphone picks up your voice, the other monitors ambient sound. Your headphones will then adjust the sound so you'll be able to enjoy the best quality. The button controls are located on the earcup, so you'll be able to change tracks, play your music and change volume without fumbling for controls on a cable. Memory foam earpads make using these headphones a comfortable experience, dispersing heat and pressure so you can wear them all day.