Hybrid Active Noise Cancelling: 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. Immerse Yourself in Detailed Audio: 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. 40-Hour Long Battery Life and Fast Charging: 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. Dual-Connections: Connect to two devices simultaneously with Bluetooth 5.0 and instantly switch between them. Whether you're working on your laptop, or need to take a phone call, audio will automatically play from the device you need to hear from. App for EQ Customization: Download the soundcore app to tailor your sound using the customizable EQ, with 22 presets, or adjust it yourself. You can also switch between 3 modes: ANC, Normal, and Transparency, and relax with white noise. Hear Your Surroundings: 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. TCO Certified: For Better Sustainability.