BDTHANKS While the XM4 headphones offer some improvements, they're also nearly $150 more at the moment. The XM3 headphones definitely won't let you down. These headphones include USB-C charging, atomic pressure optimization that can adjust for noise-cancelling at higher altitudes, a 30-hour battery life, a quick-charging feature that will give you five hours of playback after 10 minutes of charging, and multiple microphones. The Adaptive Sound Control will allow you to adjust just how much ambient noise you want to hear, especially if you're in a case like walking down the street where you might want to hear the vehicles barreling down on you.