Utilizing the built-in earcup controls, you can switch on active noise cancelling for isolated enjoyment of your favorite music. Listen as the 40mm drivers deliver 's Signature Sound, while distracting ambient noises are blocked out. Your favorite music or podcast is streamed wirelessly via Bluetooth technology from your mobile device, such as a smartphone or tablet. When paired with your smartphone, you have the added benefit of making hands-free calls using the 650BTNC's built-in microphone. The built-in mic can also give you access to your mobile device's digital assistant software, such as Google Assistant & Alexa. Use it to send texts, make calls, and get information; all while your smartphone is safely stored in your pocket or purse. For added convenience, the addition of multi-point connection technology lets you quickly switch between devices. With up to 30 hours of battery life, the 650BTNC over-ear headphones can last all day, and with a padded fabric headband and soft ear cushions, it's meant to be comfortable while doing it.