Key Features (Model Number: A3004) Reduce Noise By Up to 90%: soundcore Q20i noise cancelling headphones use hybrid active noise cancelling technology to effectively block out sounds in real-time. Hi-Res Certified Audio: Hi-Res certified audio means that you can listen to wireless music of better quality than a CD. The large 40mm drivers can also produce crisp sound with thumping bass. Ideal for Commutes and Travel: Explore more with 40 hours of playtime with ANC on and 60 hours with ANC off. And even if you're in a rush and running low on power, a 5-minute fast charge will give you 4 more hours of peaceful travel. soundcore App: Personalize your listening experience in the soundcore app with a customizable EQ, white noise for relaxation, and more. Transparency Mode: Switch to transparency mode to connect with your surroundings without taking your noise cancelling headphones off. If you want some quiet, easily toggle between noise cancelling and normal mode as well. Dual Device Connectivity: For extra convenience, connect up to two devices at the same time. The noise cancelling headphones will intelligently switch to the device that is playing audio. Long Listening Comfort: Multi-angle rotatable ear cups allow you to wear your Bluetooth headphones at any angle. Breathable mesh keeps your ears sweat-free and memory foam cushions adapt to the shape of your ears for long-lasting comfort. Hands-Free Calls: Incoming call but your hands are full? Just tap the button on your Bluetooth headphones and the built-in microphone will pick up your voice clearly for convenient conversation. Note: ANC mode is not compatible with an AUX cable. According to regulations, the maximum volume of headphones should not exceed 100dB. In order to protect your hearing, Q20i's maximum volume has been set to 95dB. It is recommended that you do not listen to excessively loud volumes for long periods of time.