Combining portability with high-quality sound reproduction, the MC-40BT Wireless Over-Ear Headphones from Mackie utilize large 40mm drivers to deliver Mackie's true pro sound signature that's crafted to deliver music as the creator intended. That pure and accurate sound can be enjoyed all day long thanks to a battery life of over 30 hours per charge, and the large, soft earpads. The addition of a built-in microphone allows you to incorporate the MC-40BT headphones throughout your day, staying in communication with friends, family, and co-workers.