JBL Everest Elite 300 is legendary sound brought to a new standard. Bluetooth 4.0enables wireless connectivity while new NXTGen Active Noise Cancelling Technology combines the immersive experience of active noise-cancelling with the ability to control the amount of outside noise to let in, giving you the power to balance awareness of your surroundings with your listening experience. With legendary JBL Pro Audio sound delivering a dynamic acoustic experience, sculpted ear cushions providing unprecedented fit on your ears, a 10-hour rechargeable battery, and TruNote Auto Sound Calibration, now you can enjoy ultimate comfort, freedom and personalization. A built-in microphone allows for easy call access.