2 internal and 2 external mics work in tandem to detect external noise and effectively reduce up to 90% of it, such as planes and car engines. The noise cancelling headphones have oversized 40mm dynamic drivers that produce detailed sound and thumping beats with BassUp technology. Compatible with Hi-Res certified audio via the AUX cable for more detail. With 40 hours of battery life with ANC on and 60 hours in normal mode, you can commute in peace without thinking about recharging. Fast charge for 5 mins to get an extra 4 hours of playtime. Switch to Transparency mode on your noise cancelling headphones when you need to be aware of your surroundings, such as transportation announcements, crossing the road, or just staying connected to the world around you.